hi mike it depends what year model itis. late models, you just unplug your ht leads 1 by 1, changing your spark plugs with the appropiate plug socket. but nplug 1 lead, change the plug and plug your ht lead on, one at a time cos you will mix your leads up and naff up your timing. early models it is all in one! it is just one big black unit which includes your coil and all you do is remove the nuts from either end of the coil and pull it off top of the plugs. for more info, email me; mattstead01@hotmail.co.uk and ican explain more specificaly
matthew stead, January 2007