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I used the original rear wiper arm from the Rover. But cannaballised a metro rear wiper motor so the jet squrts either side of the blade as it moves. Needed someone to weld it though.
I went for a citroen ZX arm as it's a single symmetical arm, and takes the new style retro-fit blades pretty well. The citroen takes a 24" blade; I've fitted a 26. Coverage in the rain is very good.
When at the scrappers I was hoping to find a car with a single front arm, but no luck - my intention being to find one for couple of quid to try.
On the back of your advice I bought a zx arm from the local dealer, and coupled it to the 25" (?) blade I'd already bought - seems to work pretty well.