New factory A/C compressor for the TC with the 3L V6 engine.   This compressor is much more difficult than you may think to find.   The one listed on aftermarket websites is 100% incorrect for the TC.   
I've told several aftermarkets parts houses numerous times now that their listing is incorrect, but they still haven't removed the incorrect compressor from their site, so I'm guessing people are buying their incorrect compressor, finding that it's incorrect and then fighting with them to return it.   
Anyway....avoid all that by getting the right one here.  This is the 1 and only NOS one I have.   First come first served.    To be clear:   This A/C compressor is made specifically for the 1990-1991 Maserati TC with the 3 liter V6 Mitsubishi engine.  It will not fit any other engine/application.    It does not come with the clutch.  You will transfer the clutch from your factory (correct) compressor to this factory (correct) compressor.  If you have any questions, feel free to ask us.