Spider Serie Speciale 2004 rims are quite different from simillar rims from alfa 156 Ti or 166 Ti. Look opposite the airvent, Ti versions have a special logo, which Spiders rims lacks. Also their size is different.
156 Ti 7×17″ and Ti logo
166 Ti 7×17″ and Ti logo
Spider Serie Speciale 2004 7,5×17″ and no Ti logo
Special thanks to Diego.