No idea but I suspect there's a good chance Garmin would mail you one if you called them and told them what happened ... or at the very least tell you what size bolt it is.

The part is little so it can easily be carried to the hardware store. We know it is metric, short, and hex head, so that limits the choices. Shouldn't be a big trial and error routine to find one that works. Just don't force it. The right bolt will thread in by hand all the way down.

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"...the street finds its own uses for things"

Yeah... it's either an M3 or M2... I will post later.

Thanks!