Karn's 156 is a pre-facelift, the steering column top is a different diameter, not just a different amount of teeth. I don't think a 147 or 156 facelift interior steering wheel would fit. You can interchange a 147 steering wheel and a 156 facelift interior steering wheel no problem.Yeap, it can be fitted, as the steering wheel insertion is aluminium while the steering column is steel, so with a bit of force when you tighten the nut. The 147/GT steering wheels have 2-3 missing teeth/ribs to properly center the steering wheel, but that is solved as I described.
I have a GT steering wheel on my 156 GTA and I know at least another 156 GTA SW with GT steering wheel, so I didn't do anything out of the ordinary.
147 is the same as all 2002-onwards 156s, no argument there. I just seem to remember the early 156 98-01 being different. I'll have to give it a try, see if they are a straight swap or if some other work is required.Of course it is, I am driving with one from a 147 GTA