measure that distance on your gaunts, and then measure that out on the piano hinges like STG suggested...you can find them at Lowe's as well...you will have to cut the hinges to match the length you need...a hack saw does well...
i think they come in 1.25 and 1.5... they might be wider too, but i think the thinner the better.
sometimes it's easier to just go in and look at stuff than think about it too much ahead of time. over thinking it can make it more complicated than it needs to be.