front calipers

[Quadreenaro]

I need to replace my front calipers (looking for used or may have them rebuilt) on a early 1986 951. It seems the 87 and later calipers are easier to find. Also, I've been doing research on calipers and it seems that the 87-88 Turbo front calipers have bigger pistons than the 86. My question is, will the later calipers bolt to the 86 spindle and work with the 86 hub and disc?

Thanks!