No, not specific to the window hole. Cargo vans will work just fine and you'll have a few inches of freedom in terms of exactly where they go.
These are fiberglass. I am welding on my van as I have to cover up the RV conversion style windows. CO got a pretty good storm this weekend so I didn't make any real progress on that end unfortunately.
Yes - 80" at their widest point, subtract a few for insulation on both sides, and it's quickly approaching only about 76".
'06 EB 350, Advanced 4x4 (soon to be MG), 6.7 Cummins + Allison, 24" bubble top. Bright yellow. The rumble bee.