What was the modification? I don't have a welder capable of burning through steel that thick - it's just a small stick welder - OK for small projects or sheet metal, but not for something structural.
I ordered the hitch from a local vendor, which fit pretty well. Just drilled holes in the frame to bolt it in.
For the spare, I cut and bent the pass side hanger and hooked into a hole drilled in the side of the hitch.
Here's a pic
