no, there are no repro panels available for the TF panel/burb quarters
yes, you could waste 90% of a fleet bedside to make the repair, but you're better off to just get at it and fab up new pieces for the rotten areas, you'd have to do some of it anyway as the fleetside is slightly different around the wheel openings .... cutting pieces from a pair of front fenders for that can be as much help
Bill