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Aside from the springs, the main differences between the Rubicon Express Extreme-Duty and Standard-Duty systems are the 5-inch long front and rear shackles (rears are boomerang), replacement braided steel brake lines as opposed to hard line extensions, and the included poly shackle bushings and greasable shackle and spring eye bolts. Otherwise, both include a T-case lowering kit, track bar relocation bracket, U-bolts, lengthened swaybar disconnects, and everything else you see here minus the shocks and U-bolt plates.