Some pics from the "big brake" conversion that I did as part of the V8 conversion back in 2007. Initially I used the stock brakes from a '93 Tbird front and rear, with rotors from a 2000 Mustang GT on the front and the stock Tbird rotors on the rear. Fronts are 10.9" with the correct 5@4.5 bolt pattern. The rear rotors were slotted to fit the new hubs, since they were 5@4.25" pattern. Later I found some PBR 2-piston aluminum calipers from the front of a late model Mustang that were a good interchange with the Tbird calipers, and weighed just about the same as the original cast iron Miata calipers, with pretty significant increase in swept area.
Tbird caliper frame with custom bracket
Not real sure why the skewed looking offset, but it fits. Must have been a good reason
Same adaptor bracket on PBR caliper. You can see the white marking where the bracket had to be relieved slightly. Obviously the shape could have been somewhat different for the 2-piston caliper
Size comparison: Original '91 Miata, '93 Tbird, late model Mustang. And the PBR calipers are about the same weight as the original cast iron Mita's
