We manufacture custom steering spline adaptors.
This one is for a Morris car.
This is another example of a Steering Wheel Spline Adapter.
Please note the 1/4inch BSF holes to mount circular flange is not shown.
The following is an example of a Ford Customline Steering Wheel which had a splined adaptor placed inside so it could fit onto a new Holden Commodore steering column.
Not that the Ford Customline steering wheel was resplined to suit the spline adaptor, which also has an internal spline to suit the Holden steering column's splined shaft.