Aftermarket Air conditioning units?

I have a Vintage air and heat unit in my 64 Signet for the past 20 years and it seems to work well. Why would they not have one for your vehicle yet one for mine?

Finding this many years later (while looking for information for my 65 valiant). Did you use the universal setup for it? They dont have them for 65's so I wasn't sure if it would work or not. Any info would be helpful. Thanks so much.