I've got several A/C compressors with bad clutches now- I've replaced them with compressors with good clutches. When I've checked around, no-one seems to have replacement parts for the clutches. Is this do-able or am I just as far ahead replacing the whole compressor? And where can I buy the clutch parts (clutch assy is $251 at everythingg20.com)? Most of the time, seems like it's just the bearing that goes and makes it noisy.