Reese 50064-58 Custom Fifth Wheel Brackets 10-Bolt Rail Kit Chevrolet, GMC, Silverado Sierra 5th wheel installation guide (beds need to be at least 6' long) Reduces install time by up to 50% Custom Brackets only require (58058) Universal Rail Kit All hardware included Kits with -58 are the 10-bolt kits complete with rails, mounting hardware and the custom bracket kit. Kits with -24 are the 4-bolt kits complete with rails, mounting hardware and custom bracket kit.