Extension springs for 7-foot doors, 25 by 42 inches, with double ends and S-hooks. This S-hooks connect the spring between the rear stationary bracket and the pulley/safety cable assembly. This set covers door weights from 40 to 200 pounds, and you pick the right rating from the dropdown. that is a wide range, so do not just guess your door weight. If you've got the old springs, check if there is a code stamped on them that indicates the lift rating. Replace as a pair even if only one spring is stretched out. Both will be fatigued at the same rate.