Need part # for rear license plate bracket

Dealership should fix?

 

I’d suggest making every attempt to remove the remains of the damaged bolt and restore the threaded hole.

The threaded bosses for the license plate screws are part of a steel reinforcement panel, shown in a Toyota bulletin for an unrelated problem, T-SB-0149-19 Rev1, “Corrosion on the Back Door Steel Reinforcement Panel Around the Opener Switch and Rear Camera” (PDF), February 10, 2021. In Figure 3 at the bottom of page 4, the bosses are near the lower left and right corners of the red rectangle labeled ③. You can also see the reinforcement panel, the bosses, and the openings for them in the outer panel, which is made of carbon fiber reinforced plastic, in a cutaway illustration for an article in Toyota’s Collision Pros magazine, “Exploring Toyota’s Vehicle Metals” (PDF); zoom at the bottom of page 2.

As far as I can tell, Toyota doesn’t sell the reinforcement panel separately; instead, you’d have to buy a complete back door panel sub-assembly, 67005-47915, list price $3,647.91, as shown in Figure 67-08, Back Door Panel & Glass, and have it painted—or find one in a junkyard. (In the catalog figure, don’t be fooled by PNC 75129C; those aren’t fasteners, just the round, rubber cushions that keep the license plate from rattling.)

If you can’t restore the original holes, you could consider mounting the license plate itself, or a new license plate bracket, using automotive-grade, double-sided foam adhesive tape, of the same style as is used to attach the “Prius Prime” name plate to the back door panel sub-assembly.

 

It’s a weld-nut, with distorted threads? Screw in the correct size* of metric thread tap, with some light oil, try to straighten out the thread damage.

* What would that be, M6x1.0?