So, as probably some of you may have already read, I was really annoyed when I first inspected my finalized 4 seater, to find that no rear speakers where fitted, as opposed to what was originally stated on the options list.
On the 2013 price list it is listed as an option and in brackets (plus rear speakers). I suspect this is an error and the rear speakers are only fitted to the Plus 8 where the Stereo is listed as standard. Fitting rear speakers would be difficult in a trad Morgan because the panel next to the rear seats, in a 4 seater, or the parcel tray is all that separates the inside of the car from the rear wheel. There is a small area behind the front seats where small speakers could be fitted and I have considered using that myself, Before the longer doors were introduced this is the area where speakers were fitted.
I can't see why it would not be possible but I have not really investigated it fully. It would be necessary to run speaker wires to the plug at the back of the stereo system but any competent car audio fitter should be able to do that.