UPDATE: **SOLD** Was $900.
Though no pics have been provided, I have added a brochure to show these were advertised for the CJ-2A at one point. Here is more info on these. I didn’t know it had supports to mount it in the rear.
“for sale t1 air compressor for willys jeep 900 or best offer”
Westinghouse T-1 Compress brochure from 1947 Equipment Book: