When I bought my truck it came with a few new panels from the PO. Including a new Pass Inner Fender. (All those parts came from Classic Cheverolet Parts, Inc.)
www.classiccheveroletparts.com
I have been buying mainly Triplus parts including a New Driver Inner Fender. Well today I picked up each only a moment apart getting ready fpor some paint. Wow was that Triplus panel much heavier!. For a pretty plain piece it was interesting that there was that much of a weight difference. looking at them the other part looks like a tin can.
Triplus gets my A+. Not sure who stamped the other part, but it also came from the taiwain neck of the woods. Just used much thinner sheetmental.