this is specific to the single mass flywheel cars; I’ve heard that for the NA ‘93 cars clutch weight was reduced? On realoem the part numbers are just for the entire pressure plate and clutch disk set. I’m doing a clutch on my 11/90 M5 and it’s got a Sachs race engineering pressure plate ending in part number 647. There is also a Sachs 765, 238 and 208. I don’t hear a lot of discussion on how they are different and which ones were OE per the build date. I want to make an informed decision whether or not to keep with the 647 or to change to something else.