The original maker was Tinnerman. I've always called them Tinnerman's. Other names : Speed nuts, speed clips.......CLICK
Home Depot has some and of course McMaster and FLAPS.

OR is this kind of what you want? Post pic of rear of your emblem. Center hood emblem or side "CHEVROLET" emblems?

POUR ON THE INFO.

Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn