ok folks, can anyone point me in the right direction please - I have four new sparkplugs, found in the glovebox of a hand-me-down car. Brand new and unused, and the previous owner of car also has no idea what vehicle they are for, however I know they are not for the car they were in. Is there any site which would list any of the vehicles the plugs would be suitable for? They are NGK ZGR5A in case this rings bells for anyone. Cheers, Ainslie