There has already been some work done in the Falcon and there is a capacitor already going onto the RF Modulator and thats sort of in the way, and quite possibly the reason why the original HD was taken out???
I cannot verify this without the original HD Mount.
I am going to maplins in a few as I have phoned them up and they have 2.5-3.5 adapters, so I just hope they are cabled ones. If not, then I wont bother