The brake caliper adapter set is for installing big 'M030' front brakes to replace the cast iron brake calipers.
The four piston aluminum front calipers and 304 × 32 mm rotors could be found from following Porsche models:
Porsche 944 S2 and Turbo with option M030
Porsche 968 with option M030
Porsche 928 GT / S4
Reference code for the left and the right front rotors: 928-351-043-60 and 928-351-044-60.
Note: 304 × 32 mm brake rotors need to be installed with brake rotor centering ring 9P-44rc-103.
Porsche 944 ’87-89
Porsche 944 S