Aluminum lower suspension owner for the FRONT regarding the back suspension redesigned combined with brand new HS bulkheads for an expanded selection of set-up changes. The rear suspension holders allow installation in upright or inverted orientations, leading to additional roll center locations for the inner hinge pins. The downward orientation associated with suspension holder is employed primarily for Dirt songs. The upward orientation of this suspension holder is used primarily for Carpet tracks. The suspension system holders allow usage of both long or standard suspension supply configurations. Machined from premium Swiss 7075 T6 aluminum and black coated. Fits XB4'21