There's no grommet for the center hole; that's the sort of hole used with post-type mounting hardware. (You know, the short bit of threaded nipple with a little cap).
Routing the wires to that center hole would place them in direct contact with the bulb.
My first pic shows the wires exiting a hole that has the edge rolled over, as if to protect the wires.
Brand is "Utilitech," which I gather it Lowes' "house" brand.
