1/4 turn fasteners that fit into a rectangle hole on the Rock-Ola Bubblers and Antique Apparatus Jukeboxes.
These are often brittle or broke due to someone trying to pry them up. Simply turn them a quarter turn and then the panel should release.
Note these are shipped as in the gallery picture, you can install and tap lightly on the end to drive it in.
Part Number 84-7027
2231 East Glendale Ave
Appleton, WI 54911