Bob, have you thought of just poping your grommets out and runing a bead of silicone in the groove to help seal them, if not that flanged you have there might be a good bet, as you may be able to get or make gaskets to go between the flange and the outer wall of your truck. (Or silicone)
Any surface mount would leave you with the question : what to do with the 2" hole behind the surface mount?
good luck,
-blizz
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2001 GMC 6500 Topkick, 22' box, dropped frame, designed to fit into a 9' garage door. 3126 CAT 6spd Man Lo-Pro 19.5's w/ 3.07 rear axle ratio
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