Ok, Im picking up some Iridium plugs...want to know if the numbers are right. For Denso, its IT20...I know that. But I can only find them in sets of 4, and $H!T they are spendy, like $45 per 4! I found 6 NGK Iridiums (TR55-IX) for $36. Is that the right plug number for our cars? Says its gapped at .050 and I read a post where someone was using that type. Does anyone know for sure?