Has anyone ever attempted to modify a set of stock returnless truck rails to accept an AN fitting for a return so an external regualtor could be used. I know they are plastic and I am assuming the ends are a plastic end cap with an o ring that is held in by the crimped on steel piece. I am just wondering if it would even be feasible to do such a thing... ( I dont want to hear buy aftermarket rails!) Ide like to see if anyones ever tried it or not...