Check the listing for details. Simrad RF300 Autopilot Transmission Link Rudder Reference Feedback Rod Ball. Condition: New. Listed at 69.00 USD. Simrad Autopilot RF300 Transmission Link Rudder Reference Ball Joints with Threaded Rod Stainless Steel Rod and Ball Joints. Overall length 13 1/2". Threaded rod length 12". May be shortened to fit.#10-32 thread size on the threaded rod and the ball joint studs. This stainless link may replace the Simrad and Robertson transmission link, which had plastic ball joints, and would wear easily.New link and ball joints.Compatible with RF100 and RF300 Rudder Reference Units.Can replace Simrad model 20193454 transmission link. Note - these ball joints do not snap on, as the original plastic ones did. They must be threaded to length and the nut attached to hold it in place. Returns are not accepted. Shipping by USPS Economy Service. Shipping to verified eBay addresses only.