Hi:

The end cap of my bumper is loose, and I see there is a hole that is missing a screw. Does anyone happen to know what size screw is used to fasten the rear bumper corner caps (not sure what they're actually called) to the rear of the truck?

See hole circled in red.

 

Well, it seems that the hole there is perhaps not factory LOL. The previous owner must have drilled it in. Nevermind!

 

Yep. Not a factory hole. Not a factory exhaust tip either.