I am adding pictures to show my unknown fender. It was suggested that it may be a bigbolt fender (whatever that is) but that makes since because it is slightly larger than my short-bed 3100. The length front to back is roughly 57" (see tape measure laid out in one of the pics on my method), The rear height behind the wheel-well is around 30". The bottom of the headlamp opening to the bottom of the fender is around 18". The inner side of the headlamp opening to the inner fender edge is about 11" (see pic). There is also a painted on part number in the inside of the fender. 3682431. I mentioned it could be a repro, but if they didn't make those then this could be NOS. It just doesn't look like its been installed although it has lots of scratches and rubs probably from being moved around for years. Nothing serious.
