I have the Mk 1 Arosa and the Mk 2 lights, you'll need £30 for the Mk 2 bulb holders and about £86 for the actual cluters - a visit to your local Seat dealer parts desk will do the trick, usually takes two working days for the parts to arrive. You can get the clusters with either a red or black background, so unless your Arosa is red, get the black ones. I saw a brand new Mk 2 blue Arosa with the red clusters (why?????)
The wiring is different, you'll have to change it - I'm finding it tricky getting the wires out but once you've done this it'll be a case of swapping them around. Arosa Racer kindly told me the Mk 2 wiring order - I'll get that posted up by the weekend!
Must say I think they look great especially on Black/Silver Arosa's!!!