task force fleetside rear license plate?

[alden]

I finally got around to ordering my rear bumper from LMC along with the license plate kit. I'm pretty sure the bracket that I ordered will bolt up to the support bar below the tailgate but I'm curious what the extra bolt holes are for in the rear bumper. The fleetside bumper has two smaller holes right in the middle which I'm wondering if they are for a different license plate bracket or for something else.

The mounting kit I bought is #36-4403 (located here: http://www.lmctruck.com/icatalog/ca/full.aspx?Page=100 ) and I get the impression now after some digging that it works for both stepside and fleetside, but you can see in their picture of the bumper (I didn't notice it before I ordered) that it has two smaller bolt holes in the middle that don't match up to anything on the bracket (and if I made them fit would put the plate a very funky angle) - Item #38-9475 here: http://www.lmctruck.com/icatalog/ca/full.aspx?Page=19

Any thoughts? Are the holes on my new bumper for something else?

Thanks!
Alden