You probably refer to the after-market knob of burlwood. I saw it yesterday on rock for ~$95 (too rich for me). If you find a web-site for it, they may have on-line instructions. Haven't done so, but I thought the factory knob just unscrews.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans