on repairs like this, sometimes it is best to find out how extensive it is before buying a lot of material. Usually you can carefully remove the damaged area, then determine how to replace and restore it.
Look at the underside and don't make any deep or drastic cuts until you can see. Maybe cut or break out the worst area, then look with a light and mirror.
2011 351RLTS Eagle, Mor/Ryde suspension & pin box
06 F350 Lariat PSD, SRW, LB, CC, EGR delete kit, 16K DrawTite hitch, Timbrens, TST TPMS
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