Sitting just now and watching Wheeler Dealers. They are doing a 1973 Saab 9-6. The windshield was cracked so they went to a guy - (This in California BTW) - with a massive auto glass warehouse. They literally walked around with the glass until they found a windshield with the same profile (Impala) and then, in the shop cut it down to fit with a glass cutter, a propane torch and some flammable liquid. It was absolutely amazing.