A 21mm adapter is required to fit our upgraded 175 amp alternator into all cars originally fitted with a 90A alternator: i.e. all 3.2 Carrera models and later 930/911 Turbo (1984 - 1989).
This listing is for the 11mm adapter only. Must be fitted with a 10mm adapter to make a total of 21mm. Adapters are NOT required for 964 alternators.
Contact us with any questions.
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