Another option might be to use moldable plastic pellets, on the inside of the rock guard. Several brands out there - Polly Plastics, ThermoMorph, InstaMorph, Moldamer - a search on Amazon for moldable plastic pellets will take you to them, small to large quantities.
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Holly
2005 Trailmanor 3023 - 2016 Ford Expedition Limited w/ Eaz-Lift WDH
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