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Tom R, There's only 1 backup plate in the installation. Greg's picture showed one of the early and later style plates. In a pinch you could use large diameter washers (fender washers) but you'll want to double or triple them up to add rigidity to the bracket.

With this style antenna mount you want to add a triangular backing plate inside the panel or the whipping of the antenna will tear it off of the truck. It's a part of the original antenna installation kit that often gets lost when they get removed from vehicles. Easy to make from 1/8" aluminum.