Tube for deep section wheels

My posh wheels are dura ace C50s, I've snapped off the end of the valve in the tube and while its holding air now, I obviously need to replace it. I was wondering what is the shortest valve people get away with on these wheels? I don't want to be dealing with valve extenders ideally.
thanks
thanks
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+1
+1 and use Continental Supersonics.
Why spend all that money on lightweight carbon rims and then put agricultural tubes in the place where you least want weight?
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