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These springs came on the Achievers, Medalist and the Elite models they connect to the leg tension indicator gauge. If your leg tension gauge reads up to 30lbs these springs will work perfectly. If you leg tension gauge reads up to 50lbs these springs will not work. We also have the the spring that connects to the dragstrap as well for an additional $5.00 if you would like to add the Achiever, Medalist and Elite dragstrap spring please choose add dragstrap spring in the options list.