I bought one of the assortments on Amazon, don't remember the brand but there's a huge assortment to choose from.
It's been useful on both my Taco & 4Rnr.
Mike
Bluesteel,
I've got the bumper and did the install myself. The trim on the rear bumper cover is pretty easy but I'd go slow. You can always do a couple of test fits and trim more if needed.
Also you're going to want some help, it's difficult to move precisely.
Mike
I just did a backup camera relocation on my truck, IIRC that style of nut is used to secure the key lock in place. There are also nuts securing the trim above the license plate but I don't think it uses that style.
Mike