I got a clutch kit from an eBay seller that turned out to be the parts that fit an 88 535i/is according to realoem and every other web site out there. I think I'm supposed to get Sachs kit KF77601 (BMW 21212226428) which is listed for e28m5/e24m6/635csi only. Is this possible that an aftermarket clutch kit for 535 is also the right application for the M5? I don't want to overreact, sometimes parts are interchangeable but then I don't want to put a weak clutch in the car. Thanks.