Thanks John, so the diameter is 100 mm. It was just an idea if I could swap the steering wheel for a Momo w/o changing the boss. I had four cars with Motolita wheels and now I'm searching for something different. Anyway my favourite wheel for the 4/4 is an all black Nardi, like this one. It will need a new boss anyway.
https://www.jhpusa.com/store/pc/catalog/nardi-personal/nardi.competition33_d.jpg
Last edited by Heinz; 07/09/15 08:42 PM. Reason: found better example