I dropped off the Greenie for a new rear tire, brakes, et al., was told the torque rod bolt in the rear suspension was sheared and was holding on by a nub. I don't know if this is common, perhaps it's worth checking. I know I never looked at it.
FYI
So, as pretty as the Moto Guzzi bolts are, cadmium plated, these nuts&washers (two days from McMaster-Carr) have a stunning black finish. That they look like powder coat is confirmed seeing they are Black Luster®, a Columbia Coatings powder coat product.