Slider boxes weld to the chassis and provide an adjustable mount for trailing arms, panhard bars and upper links. Boxes are constructed of.120 Inch wall material and are 1-1/2 Inch wide x 2-1/2 Inch deep x 6 Inch tall with a 4 Inch slot that provides 3 Inch of adjustment. This slider box has a 4 Inch x.750 Inch slot for 3/4 Inch rod ends.