The do not directly fit either however the '99 and later PBR dual piston calipers can be used on the earlier SN95 spindles by doing some grinding of the spindles at the caliper mounting ears to provide clearance. Note that to maintain balance the master cylinder will need to be changed as well because of the differing piston area between the single and dual calipers. It's a fairly common swap. Only way to use them on a '90 Fox body is by changing to SN95 spindles.

Jeff