These air spring spacers are designed for trucks with a 5 inch lift. If your leaf springs are arched 7 inches, the blocks will not be tall enough. The 5 inch blocks work with 10.5 - 11.5 inches in between your air bag brackets. The tallest they make are 6 inch air bag spacers which work with a 11.5 - 12.5 distance between brackets. If you have more than that, they will have to be custom fabricated.