I don't think that you could get a half vinyl top on any e body. Not that I know of anyway.
I've seen half tops on two , but I'm pretty sure they were custom.
1972 was the only year for sunroof's in cuda's. Not that many around really.
4500 was a good price. Here is yet another one of those, "Rare does not equal valuable" case's.
Can't wait to read some more about these cars, sdweatherman.