The compressor locked up on my '90 350sdl (603.970) last week and I have a donor '87 300sdl (603.961) that I borrowed the long block out of... Does anyone know if the compressors will interchange? I havent taken the seized one out because it's my daily driver but the electrical connector is the same, pulley, everything I can see. The one thing I don't know is if the lines are different or some other mystery thing hiding in the bushes to bite my butt. Any help would be appreciated, it's HOT! Tigafila