Looking for a nice used pair of Rear Brake Caliper cores for a rebuild project on my 2004 R53 MCS...if I am not mistaken the rear calipers are all the same on any of the R50/R52/R53 from 2004-2006....can anyone confirm? I'd like a nice complete used set for rebuilding....casting and bore condition are my only concern, I'll be replacing all seals and rubber. Maybe someone has an early take off set from when they upgraded to big brakes?