after 70 a plastic adaptor is needed bcoz the steering column tube got wider. 70 is when they moved the ignition switch from the dash to the column
on 69 and back any A or B wheel will bolt up but some are correct for only some years but they most all fit physically.
after 70 only the carry over wheels from the 60s need the adaptors to fit 70 and up (like the one in this ad).....the wheels that were newly introduced after 70 are made wider around the hub to fit the corresponding wider steering column tubes they were made for.