The Supertech 5.5mm Viton valve stem seal set for Ford Duratec 2.5L engines is supplied as a set of 16 and matches the 5.5mm stem dimension in the description. These Viton seals are packaged to service the full valvetrain and replace worn or leaking seals on Duratec 2.5L applications where sixteen seals are required.
Supertech Ford Duratec 2.5L 5.5mm Viton Valve Stem Seal - Set of 16