ISR Series Custom Mounting Kit - 2011-2016 Ford F250 & F350Product Description: This new hitch line is designed to fit the "other guys" base rails, we call them "industry standard" base rails, because nearly every other manufacturers rails are the same. So if you have the other guys industry standard rails, just take out your old hitch and replace it with an American made hitch from PullRite and just drive or if youre starting from scratch, you can install PullRites "better than theirs" industry standard base