Where are you ordering the clutch from? Beware if its Euro Car Parts as they are known to supply an inferior Sachs clutch, check this thread, also has part numbers - http://www.e30zone.net/modules.php?name ... ght=clutch
GT motor factors, I've used the BMW part number off the old clutch and ordered another from that reference, it's a 228mm clutch and they say it's from an e12 hopefully that will fit