If that part number is right, I think it is an m4.2 x 1.41 tapping thread with a floating washer. Maybe you can find something similar at the local hardware store.
-Geoff
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'12 2SS RS Convertible - Traded in.
'16 2SS Convertible - White on white, mag-ride, NPP, nav. Sold!
'23 2SS Convertible -Same as above except orange.
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