• Graphite extensions for aluminum backside uprights • 2mm lower roll center jobs • permits to help keep camber website link in same place whenever uprights rises • Lightweight • Premium-grade graphite material • Fits XB8 & XT8 aluminum backside upright #353366 • 2 pcs in set The graphite extensions for aluminum rear uprights #353366 feature camber website link mounting holes 2mm reduced which allows to go link lower when hub rises to help keep link in same position. Made from premium-grade graphite product. Group of 2. Fits: XB8 Aluminum back Upright #353366