You want to start with the right glass ...
WWW.SANDERSREPROGLASS.COM 1-800-452-6117 [WEST COAST].Then cut the shape... rubber from a tire tube .then go to a AUTO GLASS SHOP[SAFELITE] or what ever shop you have around and buy a tube of the stuff they use on replacing windshield glass .Its black and must be put on warn with a heat gun and or a very good hair dyer. [and be fast...] once on you can forgetaboutit. most if not all other repro. glass really sucks...to damn thick AND HEAVY!