I have ford Callipers on the rear of my MK3, service kit was under a tenner a side.
Not sure what ford they are from, they are identical to the VW one except for a weight arm which hangs off them.
Its an easy job to do providing the hydraulic assembly is not to worn or damaged
Thats interesting, as on the rear of mine I have one ford caliper and one vw for some reason.
They are a standard ATE/Lucas type part used across lots of makers, cant see VW using ford ones on new cars but maybe an after thought by VW service dealers who keep fixing seized rear callipers ?
I swapped my ford brakes over from my last Mk3 as the new Mk3 ones were fecked (VW ones)