part # on mounts?

Two"85s"

Learning the Ropes
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I revived some bike side mounts for a GL1xxx from a kind person that has allow me to make patterns
that I might reproduce them. In the course of my work I have found all save one has a nine digit ( part)
number stamped on them. I also found them mark "V-8-31-81" this was added with a handheld engraving
tool. Maybe another way to track what brackets fit the common bikes of the time.

I just though I would share!