GM-47960-10 will be a flat, machined tool with two holes and one adjustable peg. It will be used in conjunction with a digital angle gauge or the current rear caster measurement gauge, GM-47960, to measure the rear caster on the Y1XX. GM-47960-10 features pegs that fit into the gauge holes of the rear knuckle to support the tool, as well as holes for the pegs of the current tool, GM-47960. Alternatively, it can also be used as a straight edge for measuring caster angle with a commercially available digital angle gauge.