I don’t think it’s worth the hassle. I would just work with the rear end you have. You would need to cut off the suspension mounting brackets and weld on new ones. If you do this pay great attention to detail to re establish the suspension geometry and pinion angle. I would hire a pro fabricator if I went that route.
Brad beat me to it. It could be one of a number of axles. Bottom line, Jon if you don't know what you have post a picture and we can figure it out.
wont a full size truck rear swap into a wagon? im pretty sure they are same width and bolt pattern and run leafs.
thats less than a inch should work still. only loosing .4 inch on each side. idk if the shock mounts line up but still would be a good starting point for something you can find parts for.