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They break if you look at 'em wrong....which doubles the insult of the stupid-high price.
I got tired of it all so for the panels directly aft/above the headlights I dumped those chintzy fasteners and went with old fasioned J-nuts and sheet metal screws
Well, funny thing.... while replacing the bushings for my radiator and condenser, and had the undertray off...... I was poking around various wiring, etc and what pops out and drops on my head but one of the female 'receiver' clips. It was super dirty, as it clearly had been caught up in there for some time after getting knocked out, but it was still good. So I clipped it back in and it was good to go!
Not willing to pay that much money for the 5 of 6 lost quarter-turn-nuts I thought about an alternative. The square hole measure 9x9mm (sorry, I am a metric guy). Searching around in the net I found this kind of nuts, in German called "Käfigmutter", leo.org translates them "cage nut" or "captive nut". In M4 the size is exactly 9x9mm.
Heh, now THAT's funny. I am an IT guy, specifically coming from a 'network' background and those cage/captive nuts are exactly what is used on equipment racks for servers, network gear, etc. I have BAGS of those things.
Never thought to give them a try, will now though!
Cheap white plastic license plate fastener fits perfect and is available at any auto parts store.
It's also funny you say that too, as I was at a big box hardware store the other day and was looking at those square nylon nuts as well and thought they might work if one found the right size.
My quick & easy solution to this matter was done by me some years back, using a couple of speednuts which slide over the panel & then have 2 black mushroom heads self tappers installed. Easy to remove & no more broken plastic clips. Pictures attached.