UMI Performance 82-92 F-Body 78-88 G-Body S10 Tubular Front Lower A-Arms PolyUMI lower A Arms are fabricated from USA DOM tubing with CNC notched tube ends for a precision fit. They are jig built to maintain accuracy and bolt on correctly every time. All critical areas are TIG welded for superior strength and a clean look. UMIs lower A Arms also feature improved ball joint angle for lowered vehicles and the design provides additional tire clearance. UMI P N 3031 lower a arms include greaseable fluted polyurethane bushings for