These will mount FC 4 pot calipers onto 808 / 818 and RX3. They can be made to fit 616 and RX2 and I suspect RX4 as well.
May fit FB too. Can someone confirm the diameter of the spindle base where it meet the strut and mounting bolt distance between the holes?
Here's the info needed:
Here's the items:
Here's a link to the thread about mounting the caliper and brake rotor options.
http://rx7fb.com/viewtopic.php?f=64&t=2 ... it=caliper