27-03-2014, 06:27 PM 
	
	
	
		Its stamped/cast into the side what size it is. Research suggests that S16 ones are 22mm. Did you take a picture of it? Or remember if there was a number on the side?
	
	
	
Doesnt even own a 306.
	
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					22.2mm master cylinder from hdi/xsi
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