RTS Ford 9 Inch, Pinion Shim Kit, Ultra Case, Assortment, Kit - RTS-4333Part Number: RTS 4333 RTS Ultra Case Pinion Depth Shims RTS pinion depth shims allow you to seat your pinion gear perfectly. They're made of durable steel to withstand years of use and abuse. RTS offers these shims in a variety of thicknesses to custom fit your axle model application. 12 bolt Pinion Support Shim Kit Set of assorted shims : 1 x 004, 005, 006, 013, 016, & 2 x 010