THIS BOLT/PIN GOES THRU THE LEFT SIDE OF THE CYLINDER TO HOLD THE LARGE CAM ROLLER IN PLACE. IT FITS ON ALL 50'S,70'S 90'S AND 110'S. IT TAKES THE ALUMINUM WASHER SOLD SEPERATLY ON THIS SECTION. PIN54G @ *ALUMINUM WASHER CAM ROLLER PIN/BOLT 50/70/90/110 90481-035-000 1/21A (R2100) THIS IS THE ALUMINUM WASHER THAT GOES ON THE BOLT/PIN THAT HOLDS THE CAM CHAIN ROLLER IN PLACE IN THE CYLINDER. IT WILL FIT MOST ALL 50'S 70'S 90'S AND 110'S IT HAS AN 8MM HOLE. R2100