You can go to the B&W website and dowload the instuctions, but I just helped my dad install one on his 07 and you measure 47. 5" from the back of the bed to the center of the 4" hole for a long bed truck, which it looks likeyou have. So see if your current hole is in the right posiition, if not you will have to trim the hole to fit the B&W.
Hope that helps.