I have a 13 RGU with a heated hammock seat and the adjustable rider back rest. The rest is adjustable up and down via a pull knob and 5 or 6 different holes and is adjustable via toggle switch that is hidden under the left mid frame deflector. I wasn't pleased with the height adjustments since it wouldn't go down far enough and kept hitting me in the mid back instead of my lower , so I had my son cut about two inches out of the piece that goes into the base and re-weld it for me. Works perfect now.
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