This Gooseneck Installation Rail Kit fits 1999 thru 2007 (Classic) Chevy and GMC 1500 and 2500 LD pickups with 6.6 or 8 foot bed. Also fits 2007 thru 2008 Chevy and GMC 2500 and 3500 HD pickups with 6.6 or 8 foot bed. Use with Draw-Tite 6300 or 8339 Gooseneck Hitch Heads. Cutting of the truck bed is required for installation.