1939-1940 Mercury Eight 2nd Generation Shift Knob Adapter For Thread-less Shift Arm M16 x 1.5 Indy 500 Pace Car The heavy-duty rubber ensures a

The heavy-duty rubber ensures a non-slip grip surface for a lifetime of safe use

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1939-1940 Mercury Eight 2nd Generation Shift Knob Adapter For Thread-less Shift Arm M16 x 1.5 Indy 500 Pace Car The heavy-duty rubber ensures aIf You Are Looking For a Shift Knob Adapter That WILL NOT WOBBLE, Look No Further! This is our second generation of this part, and we feel confident it is the best solution for those difficult thread less shift arm installs in your 1939 1940 Mercury Eight. This heavy duty polished billet aluminum adapter stays put with the help of 3 robust set screws. On top of that we added The Boot Groove, which neatly tucks your shift boot under the knob for a more