A224-350R - 1978-1988 G-Body, 1982-2003 S10/S15, 1973-1977 A-Body Coilover Kit 1999 pontiac firebird Supplied is (4) 12 mm

Supplied is (4) 12 mm 10

while adding ride improvements and they also work excellent to reduce traction loss

UMI Performance's unique on-car adjuster makes adjustments easy without the need to remove the control arm from the vehicle

providing increased strength and improved bushings

A224-350R - 1978-1988 G-Body, 1982-2003 S10/S15, 1973-1977 A-Body Coilover Kit 1999 pontiac firebird Supplied is (4) 12 mmFront Spring Rate Options: 250lb 11 tall springs for drag race only. Serious lightening required. 350lb Small block cruise or drag race with lightening required. 450lb Small block cruise, big block drag race. 550lb Small block handling, all big blocks except drag.