My lawn mower has one on it, does that count? We call them a Barney knob, just local slang .
Around here if you are Handicapped you can have one on your car. They say with the power steering you don't need it and when steering wheel come back to center fast the knob can hit your hand and break it . Not sure if it is true about breaking your hand but that is what we were told in drivers ed. I do know that when in the field on a tractor it hurts when you get hit by one.