[CamInHead]

I'm also wondering how the z31 rear ARB/Sway bar compaires to S12....?

edit:

Originally Posted by Draconis

I do not know to be honest but would not be surprised if the carriers are different. Just the calipers themselves are different.

TBH I'm hoping they're the same as IIRC the discs diameter is the same and I'll probably plump for refurbed calipers (rather than do it myself).