SCW Ford 9" inch Pinion Depth Shim Kit 
you must use this Kit when you replace your Gear Set 
Shim Thickness Sizes, mix and match to obtain your Correct Pattern
0.016" / 0.013" / 0.010 / 0.010" / 0.006" / 0.005" / 0.004" (7pcs)

Suit all OEM and Aftermarket Pinion Supports and Carriers using 3/8" Bolts