When switching from 4 lug to 5 lug hubs, the shock mounts for those wanting to use their existing shocks or coilovers will need spacers. These spacers fit in the shock mount which attach to the bottom of shock. The 5 lug is a larger diameter which causes the existing 4 lug bolts to have a lot of play. These spacers are stainless steel machined specifically to the size of this upgrade for a direct and safe bolt on. Spacers are sold as a set of 4 for the complete front kit.