All of our shift knobs feature an M18 internal thread, compatible with all our adapters and shafts.Be sure to add both the wooden shift knob and the appropriate adapter or shaft for your vehicle to your cart. Categories: All Adapters & Shafts 911 914 944 964 993 986 996 987 997 718 918 981 991 992 All / 993 Walnut, Maple & Aluminium $195.00 Martini Style $195.00 Gulf Style $195.00 Walnut & Aluminium $195.00 917 Style Checkered $195.00 Ash & Walnut $195.00 African Blackwood & Walnut $195.00 Beech & Maple $195.00 964/993 Manual Shaft $195.00 964/993/996/997/986/987 Tiptronic Shaft $195.00 Carrera GT Style $395.00