here are the differences between each kit.
Economy- Adjustable 7-9" front struts, Simpler Front Drop Cross Members, Round Kicker braces, 6"Rear Lift blocks , No Diff Skid Plate & No Tie Braces between crossmembers
Standard- Adjustable 7-9" front struts, Traditional Front Drop Cross Members, Round Tubular Kicker Braces, 6" Lift Blocks
Black SS- Adjustable 7-9" front struts, Traditional Front Drop Cross Members W/ Stainless Steel Accents & Hardware, Box Fabricated Kicker Braces, 6" Lift Blocks