This Supertech valve guide set fits BMW M42, M50, S50 and S52 intake and exhaust applications and is supplied as 12 guides with a 6mm stem bore and 12.56mm outer diameter. The listing specifies both dimensions and the mixed intake/exhaust fitment, offering a matched set for valve-guide service on the listed BMW engines.
Supertech BMW M42/M50/S50/S52 Intake/Exhaust Valve Guide 6mm Stem 12.56mm OD - Set of 12