Those can be a hard to find in good condition because they pretty much all had the same issue. I have had some in the past but I don't know if I have them or sold them (I've slept since then!). I will be going through a lot of my parts this weekend and if I see them, I will set them aside.

Another common "upgrade" is to put the right rear (solid, one piece) glass on the left rear (formerly a vent) opening to eliminate the leaky vent window. It cuts down on the ventilation to the very back, but it solves the lack of availability issues and the leaky windows... just a thought

Another option would be to source the 1979 slider windows and put them in.
They have a much larger opening and are just plain cooler.

Look at the door in this ad, they made them for the back as well:

http://www.thesamba.com/vw/classifieds/detail.php?id=952704

KC

There is (or was) a place somewhere in the desert south-west called "Busted Bus."  I don't have their contact info and I'm not even sure they are still around, but I know of several people that have purchased stuff like the vent windows from them.  The buses they typically parted out had spent their whole life in the desert and don't suffer the rust issues busses around here are know for.  I'll see if I can find out more about them and post their contact info.

Their site is: http://bustedbus.com/

There's no online inventory to check, you'll just have to make a parts inquiry. But Chris has always gotten back to me very fast and usually has what I'm looking for.

I've got some under-dash AC parts. a blower assembly, switches, maybe a vent or two. Just not the under-dash unit itself. I'll be at BP this weekend, if you want to look me up, or reply here! Those things will keep you cool on a 95-deg day, if all's running right!
Anthony Henderson