Had a trawl round the scrappy, all the rover 800 arms had the same bend in them so must be later 800 ones that I have as well.
Found a set which work o.k. but park rather high up on the windscreen. Some audi ones had the perfect shape but the mounting hole was too small but if it was drilled out the tapered splined part on the back would then be lost.
Ah well, another thing to go on the list of things to be tweeked after SVA.