The compressor itself will be fairly generic, the drive pulley, mountings and plumbing fittings may be unique to our cars.
My dad had a Rolls Royce, the compressor shat itself and a replacement was not readily available and was gonna cost the national debt......however close inspection revealed to only difference between the unit fitted to the roller and one fitted to a Chev Corvette was the drive pulley......swap over the pulleys and we were soon on our way, and with shitloads less bank balance trauma!
"Keep calm, relax, focus on the problem & PULL THE BLOODY TRIGGER"