Jeff,

I can't make any promises, but my LBS has lots of vintage small parts, and I'll run over there this afternoon after the owner finishes his errands (the counter clerk said he'd be back about 2:30) and scrounge through his parts stock to see if he has p/n 3506 or something else that might work.

I'll let you know if I come up with anything.

EDIT- Dbakl is right; the same upper pivot bolt (p/n/3506) is used for the Nuovo Gran Sport.