Below is how PBR calipers bolt on 930 front and rear.
Cayenne TT calipers need to install the adapter first.
Installation for Cayneen TT caliper on 930, install the adapter before the rotor.
Drill and tap the 930 rear hub for 996 TT rotor.
Brake caliper piston size are position differently from placing front or back of wheel center line, for factory
design front of wheel line calipers to mount to the back of wheel center line. The brake bleed valve and
brake line must be rotate.

The large pistons must be in front of the brake rotor rotation.