[zeusflash]

Cheyene10,
I peeled the original vinyl off of the cardboard(very warped),cleaned the vinyl then used the original cardboard as a template for new backing made out of 1/8 masonite(sometimes called hardboard,available at the home improvement stores). I then used spray adhesive to glue the vinyl to the masonite. When I folded the vinyl around the edges I used brush on contact cement to get the strongest possible bond on the backside. My Suburban was missing the filler between the two panels on the drivers side so I made a piece of metal strap and wrapped it in the same vinyl that i covered the rear box speakers with(the wife found the vinyl at a local material store). I screwed the filler on and you can't even tell it's there. I used this same method on my 71 Blazer about 10 years ago and it still looks great. Very simple and inexpensive not to mention durable. Post more pics of yours because seeing yours progress helps to keep me motivated! By the way my Blazer is the same color as your Suburban(actually tried to talk my wife into that color but she wanted to stay original).