Rear Brake Caliper

Does anyone know if the rear caliper is interchangable with other parts ie marea, bravo???

Partco don't list them, don't fancy playing main dealer prices.

My caliper is shot and the piston wont return causing it to stick on. It's been rebuilt a couple of times but the problem returns.

I presume the reason FIAT went back to drums was because of this problem

Oh lord!...Someone else having trouble with their back brakes...
My brakes are in the shed, with various clamps pressing against the pistons!
I cant seem to get them to retract any further!!
Any luck with yours yet?...Managed to wind them back so far, but not enough.