UMI’s leaf spring and poly shackle kit is a complete, high-performance solution to lower the rear of your 2nd Gen vehicle. These springs are made with high-quality US Steel and feature multi-leaf construction, lowering the car an average of 2" to 2-½" below stock ride height. They bolt directly into the stock location with no modifications required, and the front rubber bushing is pre-installed for convenience. The poly shackle kit replaces the factory bushing with a heavy-duty, high-performance poly bushing and shackle assembly. No additional components are required. 100% Made In USA. Optional Add On: UMI 2627 leaf spring hardware installation kit includes new high-quality polyurethane isolator pads, heavy-duty Made In USA U-bolts, and hardware. Fits stock and UMI applications. Excellent replacement for worn-out isolators and corroded original hardware. This kit features a 175 lb/in rate and is excellent for street, corner carving, and auto-x. Heavy-duty clips and advanced leaf design reduce spring wind-up compared to stock. The springs are built with self-lubricating plastic isolators to reduce friction and provide consistent spring performance. The front bushings are pre-installed. High-performance polyurethane bushings offer good ride quality with a performance improvement over stock rubber. The kit also includes laser-cut heavy-duty shackles with a tough gloss black powder coat. 100% Made In USA.