"Normally" there is a small metal retainer clip to keep these things in position vs falling out once you tip the engine cover or rear trunk up or over....
The clips I have measure 12mm from the underside of the top to the closest side of the little cross pin. I believe that is how they are measured.
Some of these fasteners are designed to go into a hole once (at an angle) and then the design keeps them from falling out....but in other apps, there is a small spring steel split retainer washer to do the job......
Had a guy send me a PDF of some pieces, but fighting alligators at the moment and haven't had a chance to dig deeper...!!!
Stay tuned!
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