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The S-Works extensions are standard 22.2mm. See...
https://www.specialized.com/us/en/components/carbon-aerobar-with-aero-stem/105033
https://www.specialized.com/us/en/components/cockpit/shiv-lowstack-aerobar-clamp-set/105013
hippy
@tbc
Can you put any old extension bars into those holes or only specific Specialized ones?