Front bumper side bracket help

I need some help with my 2006 Sport - I’m in the process of replacing my fender liners, which I’ve figured out, and installing an OEM used front bumper (I removed a steel bumper, so I had to find all the brackets). I completed the passenger fender liner and wanted to attach a new bumper support to that side (the upper plastic one, I didn’t buy OEM, photo attached). It has 2 built in clips, and I see the holes they slip into, but I can’t figure out how they clip in, I have to be missing something. Any one have to replace these? I can’t find any install videos or instructions.

I found a YouTube video of a bumper replacement that had a decent view of the support, and it looks like a bolt or something is inserted into one of the clip holes (circled), probably to spread the clip and tighten it, but I can’t find the procedure or a part number for that bolt or whatever it is.

 

Pretty sure they snap in, push in hard and they snap into the fender if i remember correct.