never seen the condensors advertised seperately, so good luck with that one! The only disadvantage of printing your 35mm with the 80 setup is print size on the baseboard.
I had the B&W condensor head on my M601 so can't assist with the transformer, but if you get desperate what you could do (and what I did with my LPL C7700) is use a 'special' downlight transformer. There are many different ones available but they (lighting, hardware shops) won't have them on the shelves most likely. I searched a catalogue to find one to match the globe and it works fine.