1978-1988 GBody (All Models) Reproduction Windshield Trim Plastic seal
weather strip - 3 Piece Kit

Here is a part every GBody could use due to deterioration.

Originally GM had a thin plastic trim molding that  goes between the front
windshield metal molding & glass. It went  on both vertical side pieces and
the Horizontal top trim. Without it there is a gap between the metal molding and the windshield. This allows rain & debris  to get between the windshield & the trim. When this happens the molding clips speed up their deterioration. Then you have an expensive often hard to find piece of trim to replace. Personally I have lost the driver side & top piece trim at high speed. 
 
This is a reproduction of that plastic trim molding. You have to remove the original trim pieces in order to slide this into each molding. Once installed you no longer have to worry about debris getting behind your molding and causing rot or damages to your GBody.

If you need to redo both the  front and the back glass trim, you will need to purchase two kits. The material  can easily be cut to size. Note: The rear never came with plastic trim but can be  installed. So if your just worried about your trim coming loose or you are painting your GBody this is a perfect restoration piece.
 
You may also want to pick up some of these:
Front / Rear Window Trim Molding Clips
http://www.gbodyparts.com/product_info.php?products_id=427&osCsid=03bd1ea1db94f274ecc4032f82f732e7