I have a pair of 911 alumunum rear calipers. Not sure what car that are from. The hole spacing is 3.5" so they will fit on later 911 front struts with that spacing. They use up to a 24mm thick vented rotor. Piston size is 44mm compared to 36mm for stock 914.
Included are new Textar pads, spreader clips an SS pins. They could also be modified for radial mount for use front or rear. Please do your home work to see if they are a good choice for your car. Braking is a system that works best when properly setup.
Price is $175 plus shipping.