Rear window activation

[Boilerman1979]

Hi All, I've just purchased a my23 discovery commercial, I've had the rear seat conversion done and now need to set about activating the rear windows, from my research it appears that a new trim is needed for the front window switch (to uncover the hidden buttons) and a set of rear window switches. Can someone point me in the right direction please as I have no part numbers and I'm struggling to find any online catalogues. As always, any help is appreciated.