OK, what flat plates are you refering to? to cover up multi hole wheels ? or to replace the spindle cover? Whatever Ive done both and its just a simple machine job
I think that this is the simplest solution.^^^^^ a wheel plate is also what we used to call a flat spyder cap, correct?
But the OP refers to "Halibrands" and since those are race type wheels I dont recall spyder caps being used, so there is some confusion happening