Originally Posted by lignum vitae
SD010 FS SD010RS
Those part #'s are for the stock steel cvd in parts.
SD010FH & SD010RH are the part #'s for the hardened steel universals. As per yokomo usa these are discontinued. These are replaced with part# SD010FC and SD010RC but they are not universals, they are the same thing as the SD010FS and SD010RS but are assembled steel cvd's.