Rear Shock Mount Solution – Lower shock mounting plate designed to simplify rear shock installation on leaf spring suspensions 2.5 Inch Leaf Spring Fitment – Engineered specifically to accept 2-1/2 inch wide leaf springs for proper alignment and support Steel Construction with Zinc Finish – Made from durable steel with a yellow zinc coating for strength Precision Bolt Hole Layout – Features .56-inch diameter bolt holes with 3-5/8 inch center-to-center spacing for accurate mounting Left-Side Configuration – Single shock boss design for left-side applications; right and left plates are sold separately Steel leaf spring lower shock mounting plate. Eases the mounting of rear shocks. Accepts 2.5" leaf spring. Bolt holes are 3-5/8" apart center to center. Bolt holes are 3-1/8" center to center on flange sides. Bolt holes are 9/16" I.D. Single shock boss. Note: The left shock mounting plate is shown on the left side of the photograph. The right shock mounting plate is shown on the right side of the photograph.