These self-ejecting Dzus buttons are used primarily to hold down body sections. They mount to the outside of the body and replicate real world quarter-turn fasteners.
Here is a real-world Dzus fastener in the unlocked position.
They're individually mounted on a soft rubber backing, so no cutting is required (and no lost parts).
With 84 pieces included, there are enough fasteners here for a few cars.
See also Mounting Plates Type 1 and Type 2 that would attach on the underside of the body panel.
One set photoetched .004" stainless steel, by Futurattraction.