Travis, good job. Patience is a virtue.
When you get the new bushings just put some masking tape over the face of the receiver and carefully file them. I doubt that you will get them in "time" like they came from the factory, but not a big deal.

Did you find a spring for the safety arm? Maybe this picture will help. If you have a hardware store or Lowes or Home Depot you might be able to match up the turns to get the right tension, and cut to length.

David