Stiff alu steering kingpin plate made from Swiss 7075 T6 aluminum with integrated 10¡Æ kingpin. Set of L+R. Fits XB8.XRAY Pivot Ball Suspension XPBS¢â is a uniquely innovative concept, and smart R&D design. The ultra-robust pivot ball suspension has integrated suspension geometry adjustment, with different kingpin plates being the only optionally-available tuning parts.