Jack;
I replaced my compressor 2 years ago in my 71 280 with a factory original York unit from Mercedes dealer. The benefit of buying from MB is I was guraranteed exact fitment eliminating any need for bracket modification etc. I paid around $900 Cdn for the part. This is what's great about having a classic Mercedes, being able to walk into a MB dealership and be able to get most parts for a 40 year old car.
Sam
Sam