This is what I have ended up doing as at the time I could not find a suitable wiper to replace mine that had decided to break. I was hoping to do a full system upgrade but my hand has been forced due to the failure.

I have a wiper motor set up which looks just like this from car builder solutions configured for a single wiper. It a standard Lucas wiper setup found on Minis, land rovers, BL cars of the seventies etc.



Mine is currently 110 degree but I am considering a wider sweep, Car builder solutions sell alternative gears, up to and including 140 degree in 10 degree steps.

I found that the rear wiper arm on my 2002 BMW compact was spot on for size so decided to use one of these with a suitable blade. The arm is dead straight, a strong spring, is the hook style and of taper fitment, which I do prefer in some respects. The wiper arm was purchased from Ebay from a breakers. I am hoping the strong spring will stop the wiper lift I use to experience at higher speeds. Wiper arm is 16 inch long and I chose a 16 inch blade to fit.

This wiper required me to change to a taper wheel box which is available once again from car builder solutions.
http://www.carbuildersolutions.com/uk/tapered-splined-shaft-windscreen-wiper-wheelbox

I have now seen that CBS also sell universal arms for the taper style wheel box, that may be suitable in two adjustable lengths.
http://www.carbuildersolutions.com/uk/taper-mount-adjustable-wiper-arm-400-to-500mm

Apart from having to remove the cover for the nut/spindle I am really happy with the fit as the arm is perfectly straight it lends its self to GTM screen nicely. My old wiper was a modified handed one which never really sat 100% right.

Issues so far.
The plastic cap over the nut/spindle on the BMW wiper on my car just catches the body work, so I have removed it, its large due to the fact there is a hidden washer jet fitting normally located there.
The increased spring strength compared to my old wiper means sometimes the wiper struggles to return when the screen is not wet and engine is off when using the single wipe option on the stalk, but this is due to a voltage drop issue I currently have to the wiper and in the process of investigating the joys of old wiring.

So far not found a Nissan Micra rear arm in Kano, don't often see Micra's here.
I have just been looking CBS this morning and thought the taper wheel box and arm would be a better solution, I'll give the "gofors" a few more days and order if nothing is found.
Cheers
John

I have been looking at the Lotus Elise S1/2 wiper assembly, it is compact and comes with its own bracket which i think could bolt straight to the GTM bulkhead.
As I intend the petrol tank to sit lower in the subframe and also act as a wind deflector I should have room for this wiper asembly. Just have to find out the sweep!

I was looking into one of these for the other option until my hand was forced and the wiper broke. I can have a look at an elise at work usually one in the car park to see the sweep.

Neil

Thanks Neil, that would be great, they pop up on ebay for reasonable money quite a lot so it would be good to be sure!

Thanks for the write up Neil, good to know of problems and solutions before your experience them 1st hand. The coupe will be on the road one day...

Yes, belated thanks from me too for the helpful write up Neil. I had looked on the CBS site but must have got distracted by the classic Mini wheelbox. Your arrangement certainly looks very good but for the moment I will probably stick with what I have to hand and hope for the best.

Update, additional note added that the wiper motor/box sold by CBS is the same as the Lucas setup found on other cars.

Real world test completed this morning, I was out and about and had some rain not quite heavy enough for continuous use. Wiper worked as it should cleared the screen well and was effective at speed too. Far better than my last arm and wiper combination.

Neil

More testing this morning when going into work a bit more rain than previous test, working well. This is the best the wiper has ever been on my car.

Neil