First Place "GO Wing" Value+Plus Rear Wing Spoilers are engineered to include OE specifications and dimensions, but these spoilers are much lighter than the originals. The spoiler blade of the Value+Plus GO Wing is molded to be about half the weight of an original spoiler blade and is warp resistant. Each wing blade is constructed of a rigid ABS based thermoplastic (a proprietary blend) material for stability and offered in your choice of a ready to paint, black primer finish or an Organosol black textured paint finish. The stanchions have been engineered to contain steel inserts for durability. The included mounting components are designed of original materials for specific applications. Once installed, these GO Wing Rear Wing Spoilers look like the original spoiler that came with the car. 215-RS400KM is a basic kit that does not include underdeck reinforcement brackets or the corresponding adjustment bolts.