This is probably a stretch thinking Back Draft would consider this. With my employer in Aviation, If parts are unavailable on a current production Jet we cannibalize from the factory and off the production line in a pinch.
Looking at the BDR Boynton website there are 29 Unsold / unfinished RT3 cars, thus 29 windshields for spares....
Backdraft Racing - Cobra Replica for Sale | Backdraft Racing
Just thinking