This may or may not be stupid but I just can't figure this out. I'm running on no sleep so please keep that in mind.
I bought the OEM-style "diffuser" off eBay and it came with a couple screws to attach it. Problem is.. I can't figure out how to use these. They have a washer attached, but nothing came with it to hold the bumper up. What am I missing?

Came with about 12 of these.