This coil spring from Lesjofors may be used on the suspension of 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, and 1985 Mercedes 300D vehicles. Coil springs are designed as a component of the suspension system to help carry the load of the vehicle. This is one of the coil springs for the rear of the vehicle. It must be ordered in pairs. Though coil springs look alike, they have differences in the coil spacing, wire thickness, and tightness of the coil. A coil spring must be ordered to match the make, model, and year of vehicle it is to be installed on. This coil spring assembly is recommended for use on Mercedes 300D vehicles from 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, and 1985. It may not be the correct coil spring to use on other makes or models, and it should not be used on the front of Mercedes 300Ds.