There are I believe that there were 3 diiferent shaped bubbles for the 47G-B3.
I think that this to do with where they were built. USA (Bell), Italy (Augusta) or UK (Westland).
If you have the 1/72 version which I am currently building, the following may be of use.
You need to make sure you use the correct fuel tanks and I am not sure of the avionic fit of the CFS cabs, but the full width radio box was not used on UK fits, there is a platform on the top of the framework and HC1 (Army) had two covers on this, one for the UHF radio and one for the Tactical VHF. CFS may have used Tactical VHF in the HT2 but someone else may have the answer.
Regards
Keith