Manganese bronze valve guides are an upgrade from original copper guides.
Suitable for intake or exhaust.
Standard size 13.05mm (.514)
Order two per cylinder (12 per engine)
Fits:
911 65-89
930 76-77
930 78-89
C2/4 89-94
914-6 70-71
Reference/Interchange Numbers:
93010432150/930.104.321.50