I hadn't recently checked the torque on the main stand bolts, and while riding I lost the right side main stand bolt and the bearing/collar that goes inside it.

I'm sure I can find a substitute bolt locally, but that collar is going to be trouble. I checked the parts list on vento.com but can't make heads or tails of which part number I might need.

Until then, I can't use the main stand. Naturally, I want to fix this sooner than later, as the side stand just isn't that reliable.

Any suggestions?

It looks like you need:

14 B01091002064 1015 BOLT 10X1.25X20MM 2 $0.13
16 58509JCCT000 920 CUSHION 2 $1.78

Suitable replacements should be available at a decent harware store.

-Mike