in that time frame chevy used 2 different types of wheels and hubcaps [ wheel covers ] there was a wheel that had 4 dimples that used a hubcap that had a smooth mounting flange with a depression to grip on the dimples.no dimples and will fall off . the other wheel was smooth where hubcap made contact with the wheel and had claw like tabs that griped the wheel. if the claws hit the dimples the could fall off . the small dog dish caps fit both wheel types.