The coil over shocks that we offer have been perfectly valved and the springs are exactly what the Xterra SAS needs! Recommended coil-over shock is a 2.0" diameter 10" travel shock setup as either a reservoir or standard emulsion unit. The recommended valving is 50/70 with 1 bleed. The top spring is 8" in length with a spring rating of 300 lbs./in. and the lower spring is 12" in length and also has a spring rating of 300 lbs./in. Price includes Eibach Springs We recommend Fox Coil-Over Shocks and Eibach springs.