Those things are neat. I saw 1-2 cars with them on at Heavy Rebel car show here in NC a few years ago and then tried finding them on the Internet. I recall that at the time a few were on eBay but very expensive (in my opinion). Looks like someone could repo them cheap.
A few minutes of Googling just now and it appears nothing much has changed.
Here is one handmade, not a bad price, but not as cool as an original (like a Thermador):
https://www.etsy.com/listing/115395443/swamp-cooler-vintage-window-ac Info:
http://www.jalopyjournal.com/forum/threads/vintage-swamp-coolers.30982/ Let us know if you find anything out, sorry this post is not more helpful.
