Is the rear door on your LEER truck cap or topper getting hard to lift or won't stay up? This pair of gas struts is the exact replacement you need. Each strut provides 135 pounds of lifting force to smoothly and safely hold your topper's door open. The key specs: they extend to 17.13 inches (center to center of the ball sockets) and compress down to 11.22 inches. The end fittings are 10mm ball sockets, which should match the existing mounts on your LEER topper. Installing a new pair (always replace them in pairs!) will restore that easy, one-handed operation and ensure the door stays securely open while you're loading or unloading. A straightforward fix that makes using your truck topper safe and convenient again. Just make sure these dimensions match your old, worn-out struts before ordering.