I've been reading up on this topic lately since I just bought a 4.44 LSD and want to convert it to a 3.45 LSD.
I sent an email to Ireland Engineering and got the following information. The clutch discs and the dog ear plates are the same in all 168mm differentials after the E21. Therefore, I believe that 33141203806 is the correct part number for the clutch discs and that 33141203804 is the correct part number for 2.0mm thick dog ear plates. Having the original BMW part number makes the clutch disc refresh much cheaper than the Bimmerdiffs kit. There was a switch in parts in 09/1978, so that is probably when BMW went from 21T to 23T. __________________ 
2000 M5 -> 1996 318ti -> 1997 328i 
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