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That's a good representation. It shows the "tabs" that are part of the actual bumper cover and the replaceable plastic "clip" screwed into the body that those tabs pop into holding everything in place and properly aligned. If you have pulled your bumper cover for anything, you get where I am coming from.😁 I just pulled my sons last weekend to replace a front lamp. PITA. But easier than trying to wiggle your hand in there to change a bulb. 😏
Not sure if it helps but when I purchased my car the rear bumper was a little loose on each side and these were the clips I replaced on each end where it attached to the body. I used the existing screws but the original clips where shot.
If the original clip is gone, then you will need the screw and washer also, looks like 90159-60431 in the diagram above. Without seeing the actual area below the tape it’s hard to know for sure but if the tabs are intact, essentially the white clip goes through the bumper and body tabs and the screw spreads the clip to hold them together. This is at the wheel well end. Not sure what’s downstream of that but the fact that your body shop said it was a quick fix makes me think this is the clip he was talking about. As I recall, the clip was relatively cheap.
Yes the body guy when under the rear inner fender well(peeled it back) and stuck the clip in. I think it needs a second one though. I am going to attempt this weekend.