The '70s Innocenti turn signal switch and the associated steering column wiring are unique and I believe they have never been reproduced. If you every find a wrecked Innocenti these, along with the tail lights are the first things to salvage.

Kelley

Not having a bad day at all. Just stating laws of physics.

Kindof a jerk response don't ya think? (u havin a bad day?)

Not only that, where's the OP s'posed to get a new stalk for a 72 Inno? (surely they're different from British built, no?)

Buy a replacement. It's only a feel good Temporary fix. 

Well done, McGuyver!

I have a 1972 Innocenti Mini. I broke off the turn signal lever. There was the lever, a broken off piece of plastic, and the part on the steering column. The last part included switches and didn't look easy to replace. I super-glued the lever to the broken off piece. (I always wear plastic gloves. Otherwise I tend to glue my fingers together.) Then I glued the combined pieces to the piece in the car. I was sure it would break immediately if used. So after the glue dried I added a little more glue and wrapped black thread around the combined pieces. A bit more glue soaked into the thread nicely. After letting it dry each time, I repeated this 3 or 4 times so there were a few dozen turns of super-glue impregnated threads around the repair. It's worked perfectly and the repair is almost invisible!