What are the center bolt/pin hole location and options?
As the name implies, the center bolt holes is typically drilled in the center of the shim to allow either the shaft of the center bolt/pin (for a bolt-on shim) or the head of the center bolt/pin (for a weld-on shim) to fit. However, some applications require a hole that is not located in the center. If this is the case, specify the center bolt hole location along with the other shim specifications in the “Special Instructions to Merchant” field of the order form. A non-center hole is often required where the spring perches on an axle have been redrilled to relocate the axle forward or backwards. And in some cases, you may have an axle where the spring perches have multiple holes in them to allow for several different axle locations. Often this is done with something like a relocation plate.
