I received an 800mm Airfield Spitfire kit for Xmass that came from NitroPlanes.com. The servos I had would not fit in the cut-out in the wings. I went into their website and they had no specs for the servos. I went to the WRAM show (New Jersey USA) and spoke with each of the reps there including the manager. None of whom were the least bit interested in trying to help me out if i wasn't buying something. The manger supposedly wrote down my contact information and said he would get back to me. He never did!