I use Coords for anything where I need paired ints which represent perpendicular axes. I agree that from a conceptual standpoint size and location are different, but I prefer to use the same tool for mechanically identical things. Of course, it'd be trivial for you to adapt it to accept a Dimension object.
Also, thank you for your feedback. A thread isn't official until it has that special Krice touch (I mean this sincerely, by the way).