Many/most US brands, like Grunert, Adler Barbour, etc, use a European compressor brand (just can't for the life of me recall the name), so "brand name" is not so important. (Anybody know the name???) It's the one that had the defect that affected many brands in the '90s causing premature compressor failure (long since corrected.). I know because My Adler Barbour used one and it was replaced by the factory because the technician knew enough to get me one for free. Here is what is "key" (1) capacity of new compressor should match that of the old, (2) connection fittings should be compatible, (3) refrigerant type is critical....most of different vintages cannot be mixed. Likely your "old refrigerant" is ozone unfriendly and can be replaced only from that recovered by a technician removing old systems. (It's likely no longer manufactured) Estimate perhaps $200 for replacement of the OLD refrigerant!!!. FAR BETTER and cheaper to have a technician flush your old refrigerant from the existing evaporator system unit (ice cube tray or whatever). New refrigerant might be $20 (not inlcuding labor). Flushing takes only a few minutes. Newest refrigerant is only perhaps 5% less efficient than the old unfriendly type, so is a good choice. I bought a used Adler Barbour System on E-bay a few years ago. If you opt to purchase a used system,do NOT count on being able to reuse the refrigerant...it's most often lost after disassembly, removal and storage. And the replacement compressor would have to be flushed and refilled as does your existing evaporator system Rob Brueckner 1972 Hatteras Yachtfisherman