These parts are no longer available from Yamaha. They have been discontinued. These parts are a new reproduction of the originals. The originals have deteriorated with time, as they are 50+ years old. The part number is used for reference purposes only and no source of manufacture or supply is implied. These are a great replacement at a fair price. The chrome is comparable to the original. This listing is for a set of fork nuts. Part # = 193-23150-40-00Part Description = OUTER NUT COMPLETEModel Count = 23AT1B 1970 125 AT1 Enduro Dual-Purpose AT1C 1971 125 AT1 Enduro Dual-Purpose AT1E 1969 125 AT1 Enduro Dual-Purpose AT1M 1969 125 AT1M Enduro Dual-Purpose AT1MB 1970 125 AT1M Enduro Dual-Purpose AT1MX 1971 125 AT1MX Enduro Dual-Purpose CS3B 1971 200 CS3 Street CS3C 1970 250 CS3 Street CS5 1972 200 CS5 Street CT1 1969 175 CT1 Dual Purpose CT1B 1970 175 CT1 Dual Purpose CT1C 1971 175 CT1 Dual Purpose DT100A 1974 100 DT100 Dual Purpose DT100B 1975 100 DT100 Dual Purpose DT100C 1976 100 DT100 Dual Purpose LT2 1972 100 LT2 Dual-Purpose LT2M 1972 100 LT2M Off-Road LT3 1973 100 LT3 Dual-Purpose LTMX 1973 100 LTMX Off-Road MX100A 1974 100 MX100 Off-Road MX100B 1975 100 MX100 Off-Road RD200A 1974 200 RD200 Street RD200B 1975 200 RD200 Street