[Steeveedee]

Never saw those on a car, ever, seeing as how they have six lug holes. YMMV. The early ('64 or so) SS wheel covers had 3 "spokes" and a center cap with the "SS" symbol on them, and a sort of dished middle. All 14", on my '64 Impala and '64 Malibu.

Your second pic is a later "mag wheel look-alike" used on Camaros, Novas and Chevelles. Possibly on the big Chevies, since they didn't get 15" wheels until '68 (I think). I used to have this info down cold, but have forgotten a lot of it, along with my 40+ year old college education. Good thing I'm retired.