Yes....that's the one. Most of it is compatable with T-Rex 450 but of course, the tail drive system is not.

Gyro....the G401B is physcally bigger than the E-Sky 704 HHG. If you do it right, you could mount it inside the frame instead of on the gyro deck...done that before on scalers. The reason I put mine on the gyro deck is just for ease of adjustment but I did have my last one break in a bad crash....such is life, you will crash, things get broke.