My son needed one nut today it appears to be 10mm fine but even amongst a brewing bin full of nuts and bolts we just could not find one. Tried screw fix and tool station but they just list 10mm nuts. Does not even specify what they are... Although I know they are 10mm course. Where on earth do you buy them. They are actually of the coilover on a Nissan sx 200. No Nissan dealers near us sadly..