left hand nuts for Quickshifter

I need to order a hand full of left hand nuts for the quick shifter. is that a 4mm or 3mm or 5mm medium thread? Wallie recommended I go to McMaster to order that sort of thing... I was thinking stainless ... http://www.mcmaster.com/#hex-nuts/=dqxoyq

M4 0.7 7 3.2 10 93510A110 $6.68
M5 0.8 8 4 25 93510A115 $9.86



I got the calipers out and the rod measures 5.75mm so I guess thats a 6mm nut but .... whats the thread pitch typically?
 
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