ACDelco GM Original Equipment Gas Charged Struts are similar to standard shock absorbers, but have the added function of maintaining part of the suspension geometry design. These original equipment gas charged struts are GM-recommended replacements for your vehicle’s original components. MacPherson struts include an upper and lower coil spring seat. The coil spring surrounds the strut tube and supports the weight of the vehicle. Modified struts are similar, but the spring is located remotely and not surrounding the strut tube, typically between a control arm and the vehicle body. These original equipment struts have been manufactured to fit your specific GM vehicle, providing the same performance, durability, and service life you expect from General Motors.