The fender liner is not bent; it is in perfect shape from when it was on the car before. Both sides are 1.25" short so it isn't just one side. By looking at the stamping, it is clear that the sheetmetal was stamped to go around the bracket on the frame shown in one of the photos, so I don't think that anything else went on the fender liner to bolt to the frame. An "old guy" that is into old Chevs told me it bolts right to the frame, but this is a real butt-scratcher.
Thanks for the response. Once this is resolved I will post the result.
Bear Lake Rodder