My rear brake caliper jammed because the brakepads were worn down to 2 mm and the pistons got stuck. The caliper then after turning red hot sprayed brakefluid allower the rear of the bike.............

My question to all of you is:
Does anyone know if the rear caliper on my bike can be replaced with a from another more comon brand of motorbikes ? (Without any major modifications)
The reason i ask is... We dont seem to have a spareparts dealer for MZ in Sweden.
If you have any advice......i realy need it.