AFAIK most of the aftermarket knobs don't use threads. I have 2 Momo's and they use set screws and rubber inserts to accommodate various lever diameters. I love the Momo Alurac, but it sure does get cold on winter days. :) http://www.proflowdesign.com/alurac.html Chris Wayne Cox wrote; > My recently acquired '93 SE-R has an after-market shift knob that I don't > care for.....