Try it and report back.
According to Ken at PG, rear MSP calipers are uniquely their own. Nothing else bolts up BUT other pads will work.
Just to clarify the 5 lug Protege and MSP brakes will bolt on to any 2nd gen Probe MX-6 and 4th/5th gen 626.
The non MS Proteges with 5 lugs use the same rotors as the 93-97 cars as well as the same front pads and proabably the same front calipers. However the rear calipers and pads are different. The Protege rear pads are about 1/4" taller than the 93-97 and even the MSP/ 98+ 626 rear pads.
By swapping the Protege rear caliper, slider brackets and pads you can get a bit more pad area in the rear and some extra braking capacity. It also effectively alters the bias slightly dur to the extra swept area and people who have done the swap say it helps to reduce dive and makes for a better overal track car if you need to use stock diameter rotors.
How much for the brackets...?
I cant discuss prices now. I'll make an official thread when I have a product to sell. For now I'm trying to decide what they should be made out of ie aluminum or steel.
Sounds interesting lmk the details. I am currently running rota slipstreams in 15" which cleared on my msp calipers and fit on my rx7
Look at the space between the outer most surface of the caliper and the rear of the spokes. If there is about an inch or more there the RX7 calipers should fit.
If 11.1" rotors wont work I'm confident the 11.8" mazda6 rotors will and that the 12.6 MS6/3 rotors will offer all the room I'll need to clear the knuckle.
I'll post pics to show what the clearance issues are so everyone understands what will and wont work.
Thank you for the show of support, I'll keep you all updated.