Allparts has some nice thin double acting truss rods. One side is round and the other is flat. (They look like the Allied's rods)The round part installs down with the flat on top. I looked on Allparts site and didn't see any truss rods but I was calling in another order and asked if they had truss rods and they said quickly, "Oh yes". Apparently Allparts carries quite a few items that are not represented on their web page. Now I know to ask if I don't see it.