No wider ones are available to my knowledge. Here is a brief post on our windshield saga on another RV forum.
http://www.irv2.com/forums/f110/windshi ... 35197.html
The pinch weld area isn't very large. The gasket is a one piece deal and the keys (aside from having the correct glass shapes) is to have the installers properly clean and prime both the gasket and pinch area. They then glue the gasket fully (urethane) to the pinch area. This sits for about 1 hr. and then the glass is glued to the gasket groove. After this, the correct size (and NEW) locking strip is installed.
So far, so good on our glass.
BTW, the glass came from Duncan Systems while the gasket and locking strip came from Gulfstream.