You are right Alohamorgan, I have a Momo wheel on my recent car. But I gave you the recommendation for a Motolita because it is nice, common, generally easier to fit and more people can help you on TM with types and serial numbers etc.
The reason for my choice of Momo was that I wanted something different after three Mogs with Moltolita wheels (and the Plus4SuperSport with the bigger four spoke wheel).
Unfortunatelly all the pics are gone when I posted two years ago how to mount it. It was a bit more difficult because I had to prepare the boss of the Momo to get a reduced length and to enable it to set the indicator lights after reducing the length.
Reason for shortening the Boss is that Momo Prototipo 35cm is a bit dished if not so much.
The common Motolita wheel with it’s boss fits very good when you take a wheel without dish, at least on recent cars since 2005. I don‘t know if it is the same with older Mogs but Richards post is helpful in this area.
If you want to fit a Momo Prototipo feel free to PM and I could sent the pics belonging to this older thread. Or if more guys are interested I could refresh the old thread with pics.
http://www.talkmorgan.com/ubbthreads.php/topics/338887/Momo_Prototipo_fitted_for_4/4#Post338887
