Seco 3" Extension Kit for GPS Truck Door Bracket The Seco 5114-20-051 Extension Kit is designed to expand the fitment of the Seco GPS Truck Door Bracket, providing additional reach for larger or oversized vehicle doors . Ideal for use on full-size trucks and specialty vehicles, it ensures proper positioning and secure mounting of GPS or RTK rover poles in mobile surveying applications. Key Features • Designed for Seco GPS Truck Door Bracket systems • Adds 3" extension for improved fit on oversized doors • Includes four extensions (two top, two bottom)