or a local wrecking yard that does foreign cars and have the mating bolt with you. Real OEM spec and recycle if it's easy. Overpay happily for them having to fiddle around with you and say thank you. If you luck onto some of the older VW ones, they're about ten times tuffer than Vespa's.
edit: M6 I think, maybe measure and call. They could mail it to you right now if that's safest.
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