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2006-2012 Porsche Cayman 3/8-16 to 16mm x 1.5 Custom Shift Knob Adapter Factory Fit Precise Shifting , R, S, S, Design Aygo make-mercury-model-lynx-year-1986Achieve Precise Shifting and a Factory Fit for your 2006 2012 Porsche Cayman With All of Our CNC Machined Billet Shift Knob Adapters. These adapters come with common industry standard M16 x 1. 5 threads which fit most of our 1000s of shift knobs. Other adapters based on (M16 x 1. 5) are available in both SAE and Metric formats so you can fit any knob to any car. ADAPTER SIZE 3 8 16 to 16mm x 1. 5 FEATURES Billet Aluminum 16mm X 1. 5 (Common Thread)