Alex,
I saw these on an SE model that was being repaired at a VAG approved bodyshop. I found these were standard on the German 'Comfortline' from launch and have been standard on SE models only recently. The part number of the two struts are 6Q6827550.
I have just measured my old struts against my Mums 6N2 and sadly the 9n struts are about 60-70 mil longer (bonnet strut - 50ml) which would mean no way to fit them on a 6N2
HOWEVER, I imagine the Lupo GTi will almost definately have them as standard so I'll check ETKA tomorrow and i'll see what I can come up with.
The struts cost me £34 inc. VAT (cost price)