There are 2 different caliper assembly bolt patterns and rotor offsets.
The 80-85 are one type, 86-91 the other type. You can't mix between
those 2 groups, not even close.

The 86+ floating fronts can be Girling or ATE but you must have matching
caliper carriers to go with whichever type caliper. The Girling uses a
guide pin that bolts to the caliper while the ATE uses a guide pin that
screws into the carrier, AFAIK.

Mark

Jim Felder wrote:
> I am pretty familiar with the differences between the older "stamped" front
> suspension system and the later "cast" system. What I want to know is are
> the calipers for both systems interchangeable? Can you use 90 calipers, for
> instance, on an 83? And can  Girling and ATE calipers be substituted for
> each other?
>
> Thanks,
>
> Jim
>