2007-2018 Wrangler JK 2 Door Rear Coil Spring Stretch Kit (SYN8032-06)Synergy Jeep JK 2 Door Rear Coil Spring Stretch Kit. The Synergy JK Rear Coil Spring Stretch Kit includes coil spring relocation brackets and shock relocation brackets for use with Synergy 8 inch rear stretch brackets for 2 Door JK's. This allows the Synergy 8 inch stretch kit to be used with standard coil springs without having to convert to coilover shocks. Coilover shocks have their place, but allowing for standard coil springs takes much of the