Chk this auction out if you have the big e34 brakes- I think it'd be the same as fitted to the M1 (ie 324mm M5) but I can't remember, check it out and make sure these would eb the right ones...
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08/88 535i e34 M30+miller MAF, 'stiens, tints & teeth!
Nick, that is an earlier style seal design that works on some of the older models, but no E32/E34 applications that I know of. The ATE 4 pots use a unique and expensive (list $120) kit, the Brembo 4 pots have something similar (but less expensive).