If you ever need a windshield, try these guys

They show a windshield available for my Imperial. I find this highly suspect since nobody else seems able to get one, including vintage glass places. I've got better places to put $630 right now.

The thick/thin glass thing is a real issue, although not all current glass is thin. The replacement glass I bought for my Challenger is thinner than the original, but using a 3/8" v. 5/16" butyl rope puts the glass in the right place in relation to the mouldings. For the little I paid, I'll make it work. I bought front and rear glass for that car, and a windshield for my Valiant three or four years ago. It was under $450 for all three.