• Graphite extensions for aluminum backside uprights • 2mm lower roll center jobs • permits to help keep camber url in exact same destination whenever uprights rises • Lightweight • Premium-grade graphite product • Fits XB8 & XT8 aluminum backside upright #353366 • 2 pcs in set The graphite extensions for aluminum rear uprights #353366 function camber hyperlink mounting holes 2mm paid off allowing to go website link lower when hub rises to help keep link in exact same place. Made from premium-grade graphite product. Band of 2. Fits: XB8 Aluminum back Upright #353366