If you are doing any repairs or maintenance with your timing, it's always a good idea to use fresh hardware and replace worn or single use gaskets and seals.
Genuine BMW Hex Bolt This item fits the following BMW Chassis: E82 1M Coupe,E70 X5,E71 X6,E82,E83 X3,E85 Z4,E86 Z4,E89 Z4,E90,E92,E93,F01,F02,F10,F25 X3