my oldman went and bought a set of sparkplugs for my 172 ph-1, and they dont seem right for the car so instead of unbolting everything and finding they are wrong thought id ask on here. they are Denso w16ep-u (3018) thats whats printed on the box if anyone can shed some light weather they will fit or send me to a website that would be able to tell me would be a great help. tried the search but typing in spark plugs and denso brings up a few threads lol thanks alot again