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BMW Chassis Reinforcement Kits & Parts for BMW Z Series E85/6 (2003-2008)

Clear BMW chassis

Made in the USA

As much of an "Ultimate Driving Machine" it is, many BMW models unfortunately suffer from weak points in the chassis. Over the years we have uncovered many weak or failure-prone areas in the chassis and have developed our own reinforcing solutions for them. And we continue to be the leading experts on BMW chassis reinforcing. Failures can come from a number, or combination, of causes: improper maintenance, age and mileage, poor design, environmental factors, poor repair work, and over-stressing modifications. The longer you let your car go without repairing or reinforcing these areas, the closer it gets to crumbling apart. Our chassis reinforcement kits are designed to first identify potential weak points and then strengthen and reinforce the existing design.

Most of our kits are not labor intensive although welding is usually required. If you suspect your chassis may have structural problems we recommend taking it to a well-known bodyshop or restoration shop. (find out who your local BMW dealer uses - we sell many of our kits to dealer-authorized repair shops). Making the preventative fix simple and effective is better than a long and complicated repair after the failure. Our kits are not usually used for fixing existing damage (only your body shop can determine the correct course of action). But our kits have been proven under extreme conditions on racetracks around the world to prevent many of the costly - and dangerous - chassis problems.

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4mm Heavy Duty Rear Shock Mount Reinforcement Plate Set

For coupe models only

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:376177

Part#: 002478ECS01KT

In Stock

Sale - Save 40% $ 83.99

This product was last offered at the strikethrough price on
05-02-2026

$ 50.39 USD

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Sale - Save 40%

$ 83.99

This product was last offered at the strikethrough price on
05-02-2026

$ 50.39 USD

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A very common weak point on the 3 series BMW is the sheetmetal of the rear shock tower. The sheetmetal here is relatively thin and very susceptible to stress and fatigue. A worn out shock will bottom-out more often and this energy is transferred through the bump stop and into the metal chassis. Stiffer shocks and shock mounts also put more stress on the sheetmetal. Factor in age, mileage, and environmental conditions and it's not a surprise that we see shock tower failures often. BMW addressed this issue with reinforcements of their own but our's are thicker for additional strength. This kit mounts on top of the shock tower and can either be bolted or welded in place. Because of the shape of the rear shock tower, these do not fit cabrio/convertible cars.

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Genuine BMW Hex Bolt With Washer - 33176760336

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T#:59645

Part#: 33176760336

In Stock

12% off MSRP $ 25.16

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 22.25 USD

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12% off MSRP

$ 25.16

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 22.25 USD

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Genuine BMW HEX BOLT WITH WASHER

Heavy Duty Convertible Rear Shock Mount Reinforcement Plate Set ...

For roadster models only

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:376176

Part#: 002478ECS02KT

In Stock

Sale - Save 35% $ 93.98

This product was last offered at the strikethrough price on
05-02-2026

$ 61.09 USD

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Sale - Save 35%

$ 93.98

This product was last offered at the strikethrough price on
05-02-2026

$ 61.09 USD

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The upper rear shock bolts to the sheetmetal in the folding top well on convertible models. As the mileage goes up more and more stress is put on this sheetmetal and it can actually tear away from the rest of the chassis. Look for lttle cracks originating from the mouning holes. This reinforcement plate helps spread the shock loads around the sheetmetal and reduce stress in localized areas. Price is for the pair.

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Genuine BMW Set Of Alu. Screws Engine Su - 22110392551

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T#:21754

Part#: 22110392551

In Stock

9% off MSRP $ 31.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 28.99 USD

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9% off MSRP

$ 31.99

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 28.99 USD

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Genuine BMW Set Of Alu. Screws Engine Support -
This item fits the following BMW Chassis:
E70 X5,E82,E83 X3,E85,E86,E89 Z4,E90,E92,E93,F10,F25 X3

Genuine BMW Rear Axle Reduced-shaft Bolt 33326760361

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T#:13490

Part#: 33326760361

In Stock

10% off MSRP $ 10.27

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 9.23 USD

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10% off MSRP

$ 10.27

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 9.23 USD

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Genuine BMW Reduced-Shaft Bolt - M12X1,5X116-8.8
This item fits the following BMW Chassis:
E36 M3,E46 M3,E85 Z4M,E36,E46,E83 X3,E85 Z4,E86 Z4,E89 Z4

Genuine BMW Rear Axle Collar Screw 33326760386

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T#:12736

Part#: 33326760386

In Stock

$ 9.99 USD

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$ 9.99 USD

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Genuine BMW Collar Screw - M12X1,5X43 Zns3
This item fits the following BMW Chassis:
E36 M3,E46 M3,E85 Z4M,E36,E46,E83 X3,E85 Z4,E86 Z4,E89 Z4

Genuine BMW Front Axle Hex Bolt With Washer 31311136465

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T#:7730

Part#: 31311136465

Ships in 1-3 days

$ 7.99 USD

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$ 7.99 USD

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Genuine BMW Hex Bolt With Washer - M12X20
This item fits the following BMW Chassis:
E36 M3,E85 Z4M,E34,E36,E85 Z4,E86 Z4

Genuine BMW Front Axle Hex Bolt With Washer 31306779487

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:13350

Part#: 31306779487

In Stock

8% off MSRP $ 8.54

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 7.83 USD

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8% off MSRP

$ 8.54

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 7.83 USD

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Genuine BMW Hex Bolt With Washer - M12X1,5X55-10.9
This item fits the following BMW Chassis:
E46 M3,E38,E46,E85 Z4,E86 Z4

Genuine BMW Fit Bolt - 07119905853 - E36,E85,E36 M3,E85 Z4M

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T#:6401

Part#: 07119905853

Ships in 1-3 days

14% off MSRP $ 15.81

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 13.57 USD

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14% off MSRP

$ 15.81

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 13.57 USD

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Ensure precise fitment for your BMW with the Genuine BMW Fit Bolt - 07119905853, compatible with E36, E85, E36 M3, and E85 Z4M models. Crafted to BMW's exact specifications, this bolt guarantees optimal performance and reliability. Whether you're replacing worn-out bolts or conducting maintenance, trust Genuine BMW quality to keep your vehicle running smoothly. Invest in the Genuine BMW Fit Bolt for a seamless fit and peace of mind on the road.

Genuine BMW quality assurance
Compatible with various BMW models
Ensures precise fitment
Optimal performance and reliability
Essential for maintenance and repairs

Genuine BMW Fit Bolt
This item fits the following BMW Chassis:
E36 M3,E85 Z4M,E36,E85 Z4,E86 Z4

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E36, E46, Z3 Rear Shock Mount Reinforcement (Sold Each)

For coupe models only

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:578621

Part#: B3300044

In Stock

Sale - Save 3% $ 8.99

This product was last offered at the strikethrough price on
05-03-2026

$ 8.68 USD

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Sale - Save 3%

$ 8.99

This product was last offered at the strikethrough price on
05-03-2026

$ 8.68 USD

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This is a direct replacement for the factory BMW rear shock mount reinforcement, as equipped by BMW on Z3 models. This also fits all E36 and E46 models as well. Turner Motorsport makes our own that are thicker but these can also do a good job of preventing cracks and deformation of the rear shock towers. Priced per reinforcement plate. Order 2 to cover both rear shock towers. From 1974 to 2019, Bavarian Autosport was one of the premier vendors for BMW and MINI auto parts. We are happy to preserve the Bav Auto legacy by continuing to carry their high-quality products into the future. All Bav Auto parts will remain unchanged in design and sourced from the same OEM suppliers to ensure long-lasting reliability. We trust these parts, accessories, and upgrades so confidently that we back every Bavarian Autosport branded component with a 2-year warranty. This item fits the following BMWs: 1992-1999 E36 BMW 318i 318is 318ti 318ic 323is 325i 325is 328i 328is M3 (not for convertible models) 1999-2006 E46 BMW 323i 323ci 325i 325ci 325xi 328i 328ci 330i 330ci 330xi M3 (not for convertible models) 1997-2002 Z3 BMW Z3 1.9 Z3 2.3 Z3 2.5i Z3 2.8 Z3 3.0i M Roadster M Coupe

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Genuine BMW Hex Bolt - 07119900402 - E36,E46,E85

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:21651

Part#: 07119900402

In Stock

$ 5.11 USD

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$ 5.11 USD

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Genuine BMW Hex Bolt
This item fits the following BMW Chassis:
E36 M3,E46 M3,E85 Z4M,E36,E46,E85 Z4,E86 Z4

Genuine BMW Hex Bolt With Washer 33306760652

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:12732

Part#: 33306760652

In Stock

$ 7.99 USD

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$ 7.99 USD

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GENUINE BMW HEX BOLT WITH WASHER FOR FRONT CONTROL ARM BUSHING BRACKET AND OTHER APPLICATIONS

Genuine BMW Rear Axle Hex Bolt With Washer 33176760343

affirm Starting At 0% APR - Subject To Eligibility. See Lending Terms

T#:13461

Part#: 33176760343

Ships in 1-3 days

5% off MSRP $ 8.75

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 8.27 USD

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5% off MSRP

$ 8.75

MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.

$ 8.27 USD

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Genuine BMW Hex Bolt With Washer - M12X100-10.9
This item fits the following BMW Chassis:
E60 M5,E63 M6,E46 M3,E82 1M Coupe,E85 Z4M,E46,E63,E65,E82,E85 Z4,E86 Z4,E90,E92,E93,F22,F25 X3,F26 X4 X4,F30,F31,F32,F33,F34,F36

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