Or you could try "car-part.com"
You can do a national or regional search... or by state and zip... plus closest distance.
I know which window glass you are talking about... but you won't find it listed as rear windshield.
The site will show some vehicles with pics. If you see a vehicle close to where you live... just call and ask if the rear glass is intact... and if they can pull it for you.
Or... have an auto glass specialist meet you at the salvage yard, and cut the glass out for you.
Heck... drive your Mk VIII to the salvage yard... and have the glass specialist do the swap right there.