I don't believe the Exotek IFS will work with the TRF101, not 100% sure though, I think you must have an F104/F103. But you also have to have the Exotek F1R3 or R2 conversion, as the stock F104 chassis is too narrow for the droop screws. You must also use the Exotek adjustable upper arm set for the IFS setup, as well as the Exotek F104 servo mount.
Hope this helps!