A 380SE would use a Delphi (formerly Delco Harrison - GM) A6 compressor with metric fasteners. You should be able to buy one NEW (why screw with rebuilt) for $2-300. It is one of the most popular compressors of all time and is one of the price leader rebuilts that they advertise for $69.95.
When I went to GM training school in 1971 they taught use how to rebuild them, today they aren't worth the risk. This advise is free so it must be worthless as only experience conveys this lesson.
Owner 24 bay BSC
Bosch Master, ASE master L1
26 years MB technician