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13. The Steeda shifter accepts the stock shift knob if you want to keep an original look to your Mustang’s interior, but with such an improvement in shifting, why would you reinstall the stock plastic knob? NPD offers these billiard ball shift knobs (made from actual billiard ball material) in 2-inch and 2 1/4-inch diameters. We’re installing the 2-inch version in black along with a new leather upper boot.