Blue Ox DH9011 Gooseneck Hitch to 5th Wheel Rail Adapter 20,000 lbs gross trailer weight rating / 4,000 tongue weight rating Black powder coat finish Please note: This adapter will only work with the newer style Blue Ox Gooseneck hitches with Quick Flip Ball and twist lock collar - Part numbers - DH2*** Adapter allows a Blue Ox Gooseneck hitch to mount a fifth wheel hitch (fifth wheel hitch not included). The adapter features rail spacing designed for industry standard fifth wheel hitches. Narrow stance - 20-5/8" wide x 21-15/16" front to back OR wide stance - 29" wide x 21-15/16" front to back. Read product description below for more detailed information.