Suspa Replacement Gas Springs or sometimes called struts, gas props or lift supports This Prop is also used on Trailers, Truck caps, Motor Homes, Boats and can be used on many other products as well. Installation This is for (1) of genuine Suspa gas prop. Measurements are from center of hole to center of hole. Please make sure you measure and check part numbers before you order. If you have a different brand of prop and can't cross reference, please contact us for assistance. Please make sure you measure and check part numbers before you order. If you have a different brand of prop and can't cross reference, please contact us for assistance. All measurements are from Center of Plastic Ball Socket to Center of Plastic Ball Sockets. For detailed measuring tips read our blog on measuring gas props. Most props are designed to be installed barrel side up and shaft side down. Included is the Plastic Ball Sockets with integral clip which snaps onto a diameter ball stud. Specifications (See below for illustration): Extended Length: 13.9 Inches Compressed Length: 8.5 Inches Force: 178 = 40 Lbs. Shaft End Fitting: Ball Socket U Band (Nylon)=10mm=3/8"=.39" Body End Fitting: Ball Socket U Band (Nylon)=10mm=3/8"=.39" Actual Compressed Length 8.5" 13.9" Actual Extended Length