I am assuming that it is a Grant steering wheel and not the factory original. Which where all plastic covered steel wire if I remember correctly. The three spoke Walnut steering wheel offered in the Corvette, Chevelle, and SS Camaro with deluxe interior would be a bolt in and looks similar.
Grant was sold over that counter at K-mart and every parts store in every town back in the sixties. You had to buy an aluminum adapter to mount their universal fit wheels onto your car with a different adapter for every make. If it is from the sixties then odds are it will be one of theirs. The only other companies where Eilbac and I'm drawing a blank.
It uses the same small six machine screws as on the original to mount to the factory hub
This wheel mounts on the GM stock tele or tilt column in the corvair. No aftermarket hub needed.
Which is the the same column in the 63-66 vettes.
The wheels mounts to the classic ind hub no problem. But no sure their 67-68 hub will mount on my 66 Belair / Impala column.
The tech on the phone said that hub in catalog may not fit my column.
That is an original GM wheel from what I see. I don't think Grant or anyone else ever made one the same as that.
As far as the hub fitting, the 67 and up hub is too big outside diameter for your 66 Impala column but I know there used to be someone making that hub repro. Is it not in any of the repro catalogues any more?