Stumped...what are these for?

..........the Dumb *** trophy, that is. I took a closer look last night and there are holes in the same location on the passenger side frame rail. The holes were smaller that what I thought they should be because, without taking the bolts out, I thought the driver side bolts were held in by speed nuts. They are really only sheet metal screws. ](*,) Thanks to those who responded. Now I can add the front splash guards to my list of parts to acquire. L8r

Jim