Lancia Horn Button

[Lancialulu]

Can vouch for what Guy says but with one exception you dont need an adapter ring if you get the right blank momo button!

[ProtoTipo]

I would think Michael has the skills to make something similar to the 4 that I've made so far.

The thing is, an unmodified original Stradale steering wheel will not take a MOMO sized horn push.
The horn push hole is too small, so the original horn push is unique.

I've found that the original Stradale Ferrero steering wheels often have the horn push hole enlarged. Usually to MOMO size.
You'd hope this was done in period, but it still seems like sacrilege to me.