http://loosescrews.com/index.cgi?id=...m_id=LS-4877FK
Not quite as nice but I found some black plastic hole plugs at Lowes last week that fit nicely in the threaded hole in the boss. (Switched from V-brake to disc on the front)
I think the actual size is M10 on my bike.
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Bacchetta Giro A20, RANS V-Rex, RANS Screamer