All solid spherical bearing upper mounts increase suspension accuracy and allow for High KG rate springs. Equipped with 20 KG front and 16 KG + 3 KG helper rear springs. The helper springs settle rear suspesion down into proper shock travel and add down travel for traversing driveways without teetering on 3 wheels. Wide range of spring rates available by request. 12 click damper settings range from extraordinarily stiff to a compliant but firm ride. You can upgrade to an air spring at any time for a $900 option cost. Thoughtfully designed rear upper mount has 2 different mounting positions, one farther out from the chassis to achieve the extra clearance required for the (larger diameter than spring) bags while the inboard position is intended to give more clearance for wide wheels whn using coil springs. **42mm FLM bushing width/60mm RLM bushing width