Snoopy, the links you posted go to home page for Vintage Air. It sounds like you are asking about an electrically driven AC compressor vs the conventional belt driven compressor off of the engine. I'd like to see a more specific link.
Anyhow, you could install an aftermarket AC system in a 1600 bus. The compressor would rob some power, but it would work. This company, no affiliation makes kits for the VW Bug. Aftermarket AC
Some modern cars do have electrical driven compressors, but probably not cost effective. I have a Vintage Air unit in our Vanagon. Very happy with the result. Mark