it is just a standard 14mm plug socket. but try to get one with thin walls as my Halofrds one has thick walls and fouls on the tinware just as the plug begins to come out. its a pain. http://www.ebay.co.uk/sch/i.html?_trksid=p5197.m570.l1313&_nkw=thin+walled+spark+plug+socket&_sacat=0&_from=R40
and make sure you superglue the rubber ring in place. there's nothing more frustrating than pulling the socket out and leaving the rubber ring in place on the plug. trying to get two fingers in the tinware plug hole is nigh on impossible.
