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Would need drilling out to fit the 5/16" bolt, which would leave a very thin wall on the spigot. As usual, there's another way to skin the cat, by drilling and tapping the 5/16" bolt to create an M5 attachment point in the original boss, but that's not really any easier than just making the part I drew.
gbj_tester
https://www.bricklanebikes.co.uk/paul-components-gino-light-mount?gclid=EAIaIQobChMIpoSfno-U1wIV7DLTCh1tNQV1EAQYCiABEgJJA_D_BwE
https://www.sjscycles.co.uk/lighting-spares/black-origin8-eyelet-stub-light-mount/