GSC Power Division exhaust valve guides for Toyota 2JZ engines fit 6.6mm valve stems and are supplied as a set of 12. Offered as direct-fit guides for 2JZ rebuilds or service, they allow technicians to replace worn guides with components matched to the 6.6mm stem specification without suggesting broader compatibility beyond the 2JZ application noted.
GSC P-D Toyota 2JZ Exhaust Valve Guide for 6.6mm Valve Stem - Set of 12