don't do it... please please save ur hands and just find some bravo leather seats.
right thats the disclaimer... it's not an easy thing.. cos you have to get everything square or the seat wont move... and YES in ASH-G's car you do sit heigher due to the 2 frames welded together.
When I did my buckets I spend 23hrs making frames up, front and rear to get them to sit @ the propper height!
hey.. you wanna buy my buckets??? All frames already made.. just bolt in
The 147 front seats do need a bit of work to adapt them to the Fiats but the 156 seats will fit in straight away without any adaptation to the front runners as there exactly the same.
I know this because i had the Alfa 156 sport recliners in the front of my Brava until it was killed.
As for the rear seats i couldn't fit them due to the 90ltr tank i had for gas in my boot so didn't bother though after looking closly at them i would suggest if your going to try and replace the rear with Alfa 156 rears then try to get hold of the sportswagon ones (estate)
As these will fold down like the Brava/o the others are fixed to the car and don't move.