Bonchrshr:
It seems it'd not be so hard to buy a rim and layout and drill the correct bolt pattern, using one of your rims as a template.
I'm sure they are mild steel, and, not super thick.......
I'd probably get a rim with the most difference in bolt patterns, to try to avoid interference in the one you want.
You could even weld up the holes you don't use, once you get the correct pattern.
Does your Hustler have a "parking" brake? Mine has a handle, but, nothing connected....seems it'd be a good idea.
Henry:
I don't know where I'm going, but, I'm on my way...........