1975 Dart sport convertriple
The 'glass 1/4 panels are probably aftermarket repair panels or racing panels. Going waaaaaaay back about 25 years ago, we had a local guy with a '70 Challenger. He replaced just about everything with fiberglass panels - hood, fenders, doors, trunk lid and both rear 1/4 panels. Made for one really light Challenger. So anything is possible.
Wylde1.