Just a thought if you can't find an ad for Centerline in the years your looking for how about looking at old drag racing photos for those years and find a car running them in let's say 71-74 would that work for the government at large
They remind me of older American Racing wheels or Appliance wheels with a Cragar G/T center cap I had an old set of Cragar G/T wheel and they were 5 spoke wheel with gray spokes and a polished outer rim alot like Torque Thrust Wheel