RE: BJCraft BISIDE
Not sure Futaba equivalent but the elevator and rudder cutouts fit JR 8611/8411 or similar (full size). Wing takes JR3421 or 9411 (there are plates to fit both to choose from to install in the wing. The stock setup is 2 aileron servos on the bottom wing and a pushrod to move the top ailerons but the top wing does have a cutout under the covering if you want to use 4 aileron servos. I'm sure a Futaba guy can jump in and give the equivalent servo models.