Our left wound garage door torsion spring in the .225-in. by 2-in. by 27 1/4-in. size from Garage Door Supply Company will replace a worn torsion spring that is exactly the same size. If you have two high-tension steel springs that allow your garage door to easily open and close, consider ordering replacements for both at the same time, because they likely will wear out at about the same time. If you no longer have your owner's manual, you can rely on free guidance from our American-owned company to confirm the size you need.