It sits under three lugnuts so it won't work on a 4 bolt hub. A small bolt in the middle holds it in place, this bolt requires a key but it'd be easier to replace with a standard bolt for a socket or even a screwdriver.
Turns out the wire covers did use clips, but they come off with barely any strength.
The covers aren't moon discs, but this is Dad's beater car. He's not letting me mod anything on it.
Doesn't that look more workable for aerocovers than screwing up your wheels?