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A complete strut assembly integrates the shock absorber, coil spring, upper mount, and bearing into a single pre-assembled unit. It is commonly used in MacPherson strut front suspensions. Modern assemblies may use high-tensile steel alloys to reduce weight while maintaining fatigue strength. Installation typically requires matching the correct part number for the vehicle, such as a front left assembly for a 2006 Kia Sedona, and tightening fasteners to the manufacturer's torque specifications. Pre-assembled struts simplify replacement because spring compression is done at the factory, improving safety and reducing labor time.