Since I can't find a box... Who makes short box, box sides? I need the whole flippin thing

If none are available what the heck ya do to replace the thing? Sigh... all the freakin spot welds to drill.... oh, also who sells the box corners? where the tail light goes. Inner box sides? I'm imagining inner box sides aren't gonna happen. Basically only need the lip from the fender well to the outer side. Not real sure how to make that happen either. Front panel I have a perfect example to replace with but hafta remove from other truck. Ok, this wasn't a quick question. Mainly just need to know if the short box, box sides are available.