If the entire assembly is corroding then I guess you would have to try a wrecker; Seat Cordoba '95 should be similar to the Golf/Bora/Vento generation of VW's.
If it's just the wiper blade holder/arm part of the wiper assembly (not even sure what you call that), then might I suggest upgrading to Bosch Aero Twin wipers - they will not only do a much better job, but will also last alot longer and renew the appearance of the car. Pricey at first, but definitely worth it in the long run.
There definitely should be one available for your car - if you take a close look at the arm clipping mechanism, as well as measuring the length of the blades, you should be able to find a compatible Bosch Aero Twin wiper for it.
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