* Your Owner's Manual: This is the most reliable source.
* The Wheels Themselves: The bolt pattern is often stamped on the back of the wheel.
* The Driver's Side Doorjamb Sticker: Sometimes this sticker will list tire size and other relevant information, possibly including bolt pattern.
* Your Vehicle's Identification Number (VIN): A parts store or mechanic can use the VIN to determine the specifications for your truck.
Common bolt patterns for 1994 Silverados include 5x4.75" (5 lug, 4.75-inch bolt circle diameter) and 6x5.5" (6 lug, 5.5-inch bolt circle diameter). However, you MUST verify this for your specific truck.