When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
If you live in or near a larger city, you should be able to find one at the local pick yourself type yards. I live in CA and we have a bunch of them in the junk yards. The going rate for a complete setup is $69.00 Mine is the 73 type and I was lucky to find a fully complete system. Yours is a different system and I've seen two types. One is stock and the other is after market. If you don't live in a large city, or can't find a setup, you might want to do a search. I've been able to find many things by using internet search engines like www.dogpile.com
You could always just pay the big bucks for a retro-fit type system, but I'm the type that's always looking to save a buck. By the way, I've found many goodies in the local want ads and even found my truck in the classifieds over the net in a local city, many newspapers offer thier classifieds over the net.
Try:
www.ackits.com
www.aapak.com
www.oldairproducts.com
www.air-tique.com
www.vintageair.com
Spend some time looking into these. I am looking for an after-market setup for my '74 highboy, and have found that if you get a replacement combo heat/cool/defrost unit, you lose the fresh air intake; if you get an in-dash unit, you lose most of your glove-box; and if you get an under-dash, you lose the ducting to the floor. This is for my '74, maybe your earlier one won't be quite so traumatic. Good luck! :-)
Steve