hope all is well people!

Every now and again I see a Focus Rs mk1 or Zetec turbo online/in a mag etc and i usually notice 'NGK race plugs' but for the life of me i cannot match an equivalent to ITV27 Densos - the only other race plug i know is Champion RC501C £300+ a set! - isit a case where they are machining the head to take cossy NGK race plugs ? im after a cold set for a forged zetec engine , you know, with the stubby tab thing i dunno wat its called lol i havent been able to cross reference for an ITV 27 - 410 bhp @24 psi - i felt more of a pull with standard frs plugs with correct gap but went back to what ever Sabre installed initially ....

Any recommendations or pointings in directions would be appreciated!!!