It just came to me. They interchange them at the factory all the time. I bought the ARF. When I got it, some of the steps were already done. Engine mount, landing gear mount, servo tray were all installed. Also to tube holes and switch were cut out already as well. And these are things that are covered in the steps in the manual. So it just shows that my fuselage was one of the RTF versions. And thing thing I don't like is that the switch hole does not match the switch unit that I use.