American Shifter 29501 Ivory Shift Knob (Yellow 4 Speed Shift Pattern - 4RUL): Automotive. Buy American Shifter 29501 Ivory Shift Knob (Yellow 4 Speed Shift Pattern - 4RUL): Body - ✓ FREE DELIVERY possible on eligible purchases. Give your interior the ultimate look. 's Elite series shift knobs are made from the highest quality components resulting in a superior feel on every shift. Each shift knob is designed and printed in the USA by skilled shift knob artisans who have a trained eye on every detail. Each knob offers a 16X1.50 aluminum threaded insert in the base. This insert can be adapted to fit any vehicle on the market with 's screw-in adapters that are available in several sizes. Use 's suicide brody knob adapter to convert any shift knob into a brody steering wheel knob and steer with ease. All Elite series of Shift Knobs can be custom etched to include your shift pattern, logo or design of your choice. . . .