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Bolt Size for Varia Quarter-Turn Mount

I've picked up a Varia RTL 515, as well as a quarter-turn mount for it. In installing it, dropped the bolt that secures it, and can't find it. What size is this bolt, so that I can get a replacement.

So far, I can only confirm that it's secured with a 2.5mm hex key, and is about 20mm long, black finish.