Aluminum lower suspension holder the BACK of the rear suspension system redesigned combined with brand new HS bulkheads for an expanded selection of set-up alterations. The rear suspension holders enable installation in upright or inverted orientations, leading to extra roll center areas for the inner hinge pins. The downward orientation of suspension system holder can be used mainly for Dirt tracks. The upward orientation regarding the suspension system holder is employed mainly for Carpet songs. The suspension system holders allow utilization of both the long or standard suspension system supply configurations. Machined from premium Swiss 7075 T6 aluminum and black coated. Fits XB4'21