OEM-replacement stock length VariStruts are a bolt-in suspension tuning solution for 1979-2004 Mustangs using factory or aftermarket coil-springs. These struts will lower the vehicle ride height 0 to 1/2 inches. Can be used with tubular K-members. Double-adjustable QuickSet 2 valving lets you quickly adjust the strut’s rate of compression and extension independently with easily accessible sixteen-position knobs.