tower part number LXXA48 its a futaba dual extension/heavy duty. I use this with for all my Y-harness aplications. When I got my first giant scale plane (it was used) I imediately replaced the servos as what was in it was standard. Anyway I striped a servo just setting up linkages becasue the servo was so confused with the long leads and long y's, they were jumping everywhere when I turned the switch on. At first I thought that the cheaper high torque servos were the problem so I sent them back and got good futaba's, same problem only I got the switch off before something tore up in those sevos to. Went and did some reading and decided my problem was to small of wire and to long of y'harnesses. I use the futaba dual extension and Hobbico pro leads, they are one guage heavier than most other servo extensions on the market. I read somewhere that on a JR matchbox you are only supposed to use the extension that comes with it thus keepeing the matchbox relatively close to the reciever and then run your main extensions from it. People talk about filters, chokes and other things. I look at it like a aircompressor here on the farm, if its needed in the hay barn it will start up but real slow, it doesnt turn right on like normal and thats if your using 2 good quality cords, it doesnt work if you round up 2 or 3 regular duty cords even though the distance is the same. If its needed out past that forget it because with the addition of another cord it just wont start the motor, it just hums and burns up an extension cord. Even if you dont use futaba you can slice off the "J" part of the conector.