I put an old york compressor with the bracket I made along with an old sears under dash unit in my 53 3100. Works great here in North Centeral Texas. I bought the condencer off E-Bay. It fit perfectly in front of the radiator and mounted to the inner fender wells. I had my hoses made at a local hose maker. From my reaserch it is exactly what sears would have put on in 1954. Allthough it was a R12 unit I used 134A and it works great, 38 degrees. My 12 volt problem was solved by installing 2-6 volt battery with a 12 volt gen and regulator. My 6 volt truck power comes off the 6 volt center tap. The batteries are in series and remaine charged with 12 volt gen. I'm an origionality nut.