In the center is a pair of Black 7000 Series ShockWaves, which feature 4-inch-diameter rolling air springs (as opposed to the double convoluted design of the front ShockWaves) with a 5-inch stroke. They are equipped with covers, or AirCANs, to reduce the risk of damage from the sleeve chaffing on other components , the chassis or body, while allowing them to be mounted closer to other components than would normally be acceptable. These feature a compressed height of 11.56 inches, an extended height of 16.56 inches, and an intended ride height of 14.5 inches. The front ShockWaves, owing to being mounted inboard of the wheel, don't require as long a stroke as the rears, these having just less than 3 inches, which equates to about 5 inches of travel at the wheel. Note the stud top mount rather than an eye, to fit the Mustang II-based suspension.