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NOTE: When changing the chairs REAR SEAT to Floor Height, refer to Dimension "C" below. If 'increasing' or 'decreasing' the height determine the current length "C" and then move up or down the chart until you 'increase' or 'decrease' to get to the desired height. Then order the corresponding Axle Plate size. EXAMPLE: If the dimension "C" was 3.70" and I wanted to increase the Rear Seat to Floor height by 2", I would find a 5.70" dimension "C" which would correspond to a number 8 Axle Plate and utilize 1 spacer.