Supertech valve guides for the NC MX5. Fits 2.0L as well as 2.3L and 2.5L MZR/Duratec engines. 5.5mm internal diameter to pair with Supertech's valves which have a 5.48mm stem.
Price is for a full set of 16 guides; 8 intake and 8 exhaust, enough for one full engine.