['ol Pinion head]

If rear glass or side glass is FACTORY TINTED, I'd search out very nice original tinted glass.
The replacement tinted glass from every catalogue or restoration parts vendor that I've ran across in the last several years sells the same junk, just follow any of these freshly "restored" late 60's early 70's puppymill builds. With the sun hitting the back glass, you will see an odd rainbow effect. On the windshields, every new ordered one I've touched for the last 15 years has been thinner. Not really something that has bothered me, I wish the front tint bands were exactly like original LOF windshields from that era, but oh well