That's the one. It is a generic trim fastener used in many applications. First I bought from a local paint and body store, early 80s. Later I ordered online from Mr. G's Fasteners.
For this grille application there are a couple spots where you might consider trim or remove the spring wire. You wouldn't want it sticking out of a gap between 2 parts. If you pay close attention to which way its turned at install that cant happen.
As for those smaller studs in the inner surround that turned in the aluminum channel... all thread. I used brass screws. Heated and some hammer reshaping, bent 90 degrees, created a head that aint going to turn.
