Will 73 dart swinger back glass fit 71 scamp?

Not if the one car is a 4 door and the other a 2 door. The four door glass is slightly taller.

I lucked out with my $150 parts car, it's a 2dr automatic 318 car just like my Scamp... it was worth the $150 just for the front disks, big bolt pattern axles and rallye rims I swapped :P - but yes, I think I have my answer! which is awesome because glass can be a bit pricey...