The Alfa 155 have a lot of parts identycal at Lancia Dedra/Delta and Fiat Tipo/Tempra,and another are nearly identycal,but not identycal.
Be careful about that.The right window of my Alfa is almost gone,but it go very slow,and sometimes stops,I ask about the eletric motor,and its too expansive to be the same like Fiat Tipo.
Better you go to a parts shop and ask about the price and reference number of the electric window of the Fiat and of the Alfa,and if its the same,go on.
you can disabled the door and put grease on the wire which go up and down the window,that's cheaper,jeje.I ask for the price of the electric motor of the window and it's 17.000 pts,102 euros.(I'm spanish).