(M50 - M51 - M52) Valve Stem Size: 6 mm Diameter (A): 28.20 mm Inn Step Diameter (C): 17.17 mm References: Double Spring-7 Degree Pro CNC Ferrea Racing Springs #S10049
E46) (S54) Valve Stem Size: 6 mm Diameter (A): 25.27 mm Inn Step Diameter (C): 16.8 mm References: Dble Spring-7 Degree Pro CNC Ferrea Racing Springs #S10156 Use Factory OEM Valve Locks
E60/E82/E91/E92 (N54) Valve Stem Size: 5 mm Diameter (A): 20.32 mm Inn Step Diameter (C): 15.74 mm References: INTAKE Single Spring-7 Degree Pro CNC Ferrea Racing Springs #S10158. Use Factory OEM Valve Locks
E60/E82/E91/E92 (N54) Valve Stem Size: 6 mm Diameter (A): 20.32 mm Inn Step Diameter (C): 15.74 mm References: EXHAUST Single Spring-7 Degree Pro CNC Ferrea Racing Springs #S10158. Use Factory OEM Valve Locks
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