Here are some photos of the driver's side bed side panel from my '51 3100.
Overall viewFront where angle strip mountsTypical fender mount holerear below bed floorTrying to decide whether to patch the rust holes (have already done that on the passenger side which wasn't quite as bad, but needs a stake pocket.
The trade off is to spend the time and effort to patch it up or just buy a repop bedside panel. Since I'm in Alaska, the cost is going to be about $100 more than you lower 48'ers would pay, unless I can consolidate some other parts to spread some of the freight costs around. I haven't looked around locally too much for better replacements, which is an option as well.
Any opinions or comments are welcome.