Hi, I'm building an old car and have fitted a Corsa B PAS column unit to it. It's the adjustable rake type but other than that, I don't know any other details.

Problem I have now is finding a steering wheel boss that isn't for a 17mm spline which I believe is for non PAS cars.

Where's the best place to buy a steering wheel boss that will fit my 21mm spline column? I tried Demontweeks and they couldn't help.