Kits come with gaskests, rings, valve plates, inserts for the filters, and small pieces of rubber tubing that I'm not sure what they are for yet.
From the distributer that I used, it was $106.00 plus tax of course and readily available.
I ordered one kit just to see if rebuilding was feasible. Very easy if you pay attention and mark the parts before disassembly. Maybe 1 1/2 hrs, back in service.
Gast recommends a rebuild after 4000hrs.
I will be doing several more shortly.
Gast compressors Rock. Wouldn't consider any other.

OC