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These kits cannot be used if Drum Brake is present. If changing wheel size and anti-tips are present, new anti-tips may be required. If changing wheel size or style, new axles and/or receivers may be needed. For the Catalyst 4 or Liberty, new axle plates may be needed. For CR45 if changing wheel size and Attendant Foot Lock or T-Arms are present, spacer 112503 is required which can be found on the CR45 Axle Plate page See chair specific axles page for axle and receiver utilization.