Aftermarket steering wheel

[drury318]

Hi, can anyone help?, I want to fit an old Mountney steering wheel to my Roadster but I can`t find anywhere to buy a boss to suit my Sierra column. There are plenty for the new Mountney M style wheels but these have a different size hole setup in the centre of the wheel, mine has the hole centres 100mm apart and a 90mm big hole in the centre.
Failing this does anyone have a wheel/boss combination that will fit?
Thanks, Dennis