License Plate Bracket

[K10Kent]

I've been reading this forum for awhile now but this is my first attempt at posting. Hopefully the picture works OK, if not, be patient and I will try again.

I bought a license plate panel from lmc and got it last night. It's too wide for the opening in my bumper. My opening width measures 15". I'm confused by this. My bumper looks like the sport bumpers that everyone else has on these trucks. Is there something I'm missing? I only see one license plate panel option.

Thanks for all the help and I've already learned so much from this group.