For the C-Clips I used 1/4”x20 U-Type Body Fastners (M6 1.0 will work too).
For the corresponding bolts I took 1/4” 20 1/2” Bolts and trimmed them down to about 5.5-6.5mm and also trimmed the neck of the U bolt so it would not exceed the thickness of the material. I then added 2 flat washers to the bolt head.
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The reason the bolt has to be shortened is so it does not stick into the inner portion of the c clip which will scratch the fender.
This is not optimal, I’m up for better suggestions.
I would like a better bolt/fastener, but the C Clip must stay unless you want to drill, have to slot/thermoform the plastic (hard), or permanently damage your bumper/fender (aggressive clips with teeth).
This fastener BARES NO LOAD. It is simply there to keep the neck of the flap firm against the fender and orient the flap.