The Saito .56 is the same size as their .45 and .50s and will fit just fine. The Dubro linkage is great or you can whip one up yourself from a 1/2A U-control (remember those?) bell-crank. You can also reverse the throttle arm to the bottom if there is enough room in your mount, and failing all that, you can make a trombone bend in the linkage wire to double back and connect from the front to give an offset. Any way you do it will be just fine. Don't forget to explore mounting your Saito sideways to put the exhaust out the bottom and let you fuel up without having to pull the pressure line from the muffler.

quint