CRG offers several different steering shafts for optimum chassis tuning ability. They offer them in 2 position, 3 position, and 5 position. This allows you to change where your tie rod end attaches to the shaft which effects the Ackerman. Ackerman is what makes your kart steer faster or slower.
They come in the 100cc and 125cc. If your kart has front brakes you would need a 125cc steering shaft. Otherwise you would order the 100cc shaft.