Replacement Parts?

The taillight frame that includes the license plate bracket is broken so the license plate can no longer be bolted in place. As I was opening it using the (supposedly)flexible retainers on each side, to see how much trouble replacement/repair was going to be, one of them broke. No biggie, I can silicone seal the lense and wire the license plate on. However, I would like to replace with a new one but do not know where to find one. I spent an hour online searching, apparently in the wrong places.

Who can point me in the right direction.

Thanks in advance.

Texas2some
ps, I also need a cover for my electricazl cord outlet. Again plastic fatigue.