When a spring in a gadget or part has taken a changeless set as a result of being overemphasised, spring replacements are needed. Hatchlift Kits are built to fit LIGHWEIGHT RV doors, such as those found on Travel Trailers, Fifth Wheels, and many Motor Homes. We suggest ordering the next larger size for RV doors with slam latches. We suggest installing a lift on both sides of RV doors with a width of more than 27 inches. To know more, visit us: https://www.hatchlift.com/brackets-accessories/bracket-kit-standard