Jesse
You mentioned it was a Junk yard pull, what vehicle did you pull it from, looks like it was made to fit.
Terry, another option would be the tire carrier from an M38 jeep, you can buy these over the counter at Military Vehicle suppliers like Midwest Military. They will mount right on the tailgate however you should put some reinforcement on the gate. I think one of the guys here modified his 3a gate to take the extra load, it was just a couple of small angles if I remember.