Theo,
Concept-1 in Calgary has new windshields available - they are not that expensive.
https://store.concept1.ca/Windshield-Porsche-911-912-VFX-FW00193CLN/
I purchased a dash cover from them too (new one) but I think that was a special order and not something they stock necessarily, but give them a call. The owner's name is Ken and he's big into early Porsches.
-Keith