The Kits that Ken Wilfy posted have the parts that you *need*, although replacement of undisturbed O-rings would be optional, IMO, since they are only 2 years old.  You'll also need A/C flush to flush the lines to make sure any metals or particulates coming out of the compressor are flushed out, and always, always replace the receiver/dryer everytime the system is open. Easy and cheap. If you're dropping the A/C cabinet (which you should since you can't flush through the expansion valve) I'd take the evap to an A/C shop for flushing and pressure testing (cost me $22 the last time I did mine).

Keith Hughes
'86 Westy GenV Turbo (Marvin)

 ------------------------------
 
 Date:    Tue, 17 Jul 2018
 06:28:49 -0700
 From:    Toomey Douglas
 <drt@UOREGON.EDU>
 Subject: A/C compressor
 
 I am looking to replace the A/C
 compressor on my 87 vanagon.  I had the =
 system switched to R-134A about 2 years
 ago, worked remarkably well and =
 quickly cooled car.  Last fall I
 began to hear some noises from the =
 compressor (it was original), so
 removed the belt.  I got a quote from a =
 local shop (Eugene, OR) that does good
 work and understandably if they =
 are going to fix it they want to check
 everything, which requires taking =
 out rear cabinets to get access to
 expansion valve, etc.  This would be =
 pricey.
 
 My questions:
 
 Besides installing a new compressor,
 what would I need to do to make =
 sure the rest of the system is not
 compromised?
 
 Where can I get a compressor?=20
 
 Any good links on DIY would be great.
 
 Thanks!