ARA Air Conditioning Unit

"Back in the day", there were many companies that sold AC kits. In the 80's and 90's even many manufacturers had kits available for dealer installation. I used to go to the local Mitsubishi and Datsun dealers one or two days a week, and do their AC kit installs on new vehicles. Most could be completed in 2-3 hours.
Heck, even John Deere had a kit for their farm tractors. It used the old GM A6 long skinny compressor.
PS: The old "York" style compressor is still available new. Not the same company, the "rights" were bought by someone else.