So I'm trying to take off the rear end caps off my XJ I can't seem to get the one closest to the rear tire off. I've tried all my sockets from 3-10 And none of them seem to fit the little bolt. Even though the size of the hole wont let a 7+ socket fit. I just can't get it off for the life of me. What size bolt could it be?

 

"rear end caps" (?)

Bumper trim? try 1/4"

 

I'm pretty sure rhat those are torx bolts