I bought a set of GM maro wheel trim back in the day and was only able to use the rear pair. There was no way the fronts were going to work. Maros have a totally different shape to the opening. Plus they have those fender extension things in the front that the parking lights are in. I've still got em if anybody knows someone looking. They've been hanging in the window so long the blue and white wrapper rotted off of them.
The fronts I bought from Pontiac were $26 a piece in '82. I about sh(t my pants. That was like a whole weeks paycheck for me for the pair.