#524 510/530/550 Main Gear Wire Kit
#550RS 90 deg Pneumatic Main Retracts RoboStrut Ready
#551RS 85 deg Pneumatic Main Retracts RoboStrut Ready
#552RS 95 deg Pneumatic Main Retracts RoboStrut Ready
#553RS 100 deg Pneumatic Main Retracts RoboStrut Ready