The springs you received are what is rated for the height and weight of your door as ordered. The width of your door is not a factor because Torquemaster springs are self anchoring to expand and contract inside the spring tube. There must be empty space inside the tube for this to happen. Torquemaster spring tubes are teardrop shaped. The anchor cone on the end of the spring that goes inside the tube is also teardrop shaped. This design allows the anchor cone to lock into place when wound to provide the tension needed to lift and lower your door. As this happens the spring coils will stretch and contract. You do not connect the inside cone with anything inside the tube. Make sure your spring tube is completely empty before installing.