Mopar A Body 70-76 B Body 68-70 Rear Pop Out Window Hinge Set 2932230 reproduction
Looks like they are having some supply issues with these. Call Jim Fillmore at DMT, he is a good guy and a great resource. He will steer you straight.
As for the glass, polish away. If it's hard water stains, maybe try some CLR on it first. Grab one of those green/yellow kitchen scrubbies that are soft on one side and scratchy on the other. A little elbow grease should get them out. For polishing, use a cutting compound first and then a polish. I've always used Meguiars 105 & 205 (in that order), and have always had good results. Just a dab will do, don't overdo the 105! Use a pneumatic or electric polisher, hand polishing probably will be tough to get anywhere.
