THIS IS THE LARGE IDLER ROLLER THAT IS IN THE CYLINDER. WORKS ON ALL ATC AND CT 90'S AND 110'S (NEW_TYPE) WIDER THAN MOST OF THE ORIGINAL 90'S WERE, BETTER ! 40M @ *NOS OEM CAM CHAIN ROLLER S90 CL90 SL90 ATC90 US90 CT90 SEE FITMENT CHART 14610-028-010 7/19I (302L)THESE ARE THINNER THAN THE NEWER VERSION THAT IS NOW DISCONTINUED,, BUT THEY WORK FINE AS LONG AS YOUR CAM CHAIN STAYS ADJUSTED CORRECTLY fits: Honda ATC90 US90 K0 1971 Honda ATC90K1 1973 Honda ATC90K2 1974 Honda CL90 1967 Honda CT90 1966 Honda CT90K1 1969 Honda CT90K2 1970 Honda CT90K3 1971 Honda CT90K4 1972 Honda S90 1965 Honda SL90 1969 302L