Origanaly thier is a chrome strip like the 67-71 door pannels has that holds the top of the pannel and then it has screws at the bottom just like the door pannels . I can try to get you some pics tomarrow. for the dubble wall top you had to remove the pannels to remove the top. Im re doing mine with with a plastic pannel you can get from lowes its smooth and has little bumps on the other. Im going to have it covered in the same black vinel as my door pannels.
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Earl
68 2500 4x4 GMC Burb
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