Replaced the cylinder head on my '86 300e yesterday and was just a few minutes away from smelling exhaust fumes and discovered the rotor drive hub would not fit into the end of the new camshaft. (What a letdown) It was a larger diameter than the hole in the new camshaft. The bolt in the new cam is a larger diameter than in my old one. I need a hub with a smaller diameter but with a larger bolt hole inside. Any help in identifying what I need and a good place to get it would be greatly appreciated.