You are bidding on a RARE NOS John Deere D engine crankshaft timing gear. It will fit all models of the unstyled D John Deere tractor after serial number 58298 and newer. The JD part number is D 1163 R. It has 32 teeth and it measures 3.490 on the inside diameter.This is a very rare part that is hard to find in any condition, much less in NOS condition. I got these in a load of NOS parts I recently bought. Please feel free to ask any questions you may have on this item. Good luck and happy bidding!