I was in some college classes recently, and we did a TON of 3D printing. That plastic is tough as nails. When entering your design in to Cura or whatever software you use to create the G-code for the printer, the user would only need to be sure they selected the option to NOT make the part hollow with internal supports. Make it a completely solid piece and it would outlast the truck pretty easily. It would be hard on the paint though, as it's quite abrasive, though you could likely coat it with a dry lube and have no problems..
Given the measurements, if I was still in those college classes, I could whip up the 3D part using Inventor in less than 30 minutes easily.
Sorry, but I can't loan anything out. It's not hard to prototype parts such as this just by using your own measurements. IF you want it bad enough. I'm currently doing that with a Sport Trac front brake conversion because no one would lend me their brackets, or make me a set for $$$..