All of them will work but the track increase is less with 85 924S ones or 86 944 Turbos. I was told that mine are actually of a 924S but the part number is a 951....so I do not know how reliable the 924 info is.
It is easy to identify the later ones.....87 and up. The disk has a big offset and if it does not have the disk on the hub with the studs does not sit flat on the aluminum arm. It looks like a cone. That is were the increased track width comes from.
Hope this helps.
Alex
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