21 23 BRONCO HEAVY RATE REAR COIL KIT SSC8425CAGY Crafted from lightweight and robust CLRJ_RC530E Crafted from lightweight and robust T6 aluminum which never rusts PartNumber: 203015 The ICON Vehicle Dynamics Heavy Rate Rear Coil Spring Kit is a dual rate coil spring kit that provides extra weight capacity for those who frequently load out the rear of their Broncos with extra gear and equipment while maintaining excellent on and off road performance characteristics The Heavy Rate Coil Spring Kit simply includes the replacement Heavy Rate coil springs used to retrofit existing ICON Rear Coilovers to the Heavy Rate specification