I am sorry, I am certain that the rear calipers were different on my 84 500sec so assumed that all the aluminum arm cars would have them. Those look to be pretty much the same as on the 123 cars.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.