dual function resevoir? huh?? I take it this is a hard plastic line, with the high-pressure fitting on it, that takes a Ford-tool, to remove it? If it is, I believe Ford is your only choice. However, even your local ford parts dealer gets their parts from somewhere more local than a warehouse. For example, I used to work at a parts-store distributor warehouse, and there was practically everything available there - mostly fuel, exhaust, emission, tune-up, ignition and electrical, as well as a few cosmetic pieces.
SO, if I were you, I'd try to find that parts-store distributor warehouse, and see if they sell to the publlic - the one I worked at did
If nothing else, you might have to use a short length of regular fuel hose