I bought a complete set from an 04 GTO and will put those in I was able to find a complete step by step direction guide with pix and wiring info. It was on another site hopefully its ok to post a link:
http://1badgto.com/seats.aspx

I will post pic of my project once I get some ( currrently out of the country )

a while back i put 06 gto in my 64 chevelle
fronts were pretty straight forward just had to cut seat floor brackets to lay flat against floor and then used .5"X1.5 rectangular metal tubing to level it out
the rears I had to do fight with
youll have to cut the inner structure because they are a bit to tall and also progressebly cut the plastic under it to accomodate the your floor I also built a center console for it as the seats were way narrow
google frank's chevelle it should lead you to a cardomain page I have a few pics there

you can also cut a small hole on your floor so the rear seat latches off and on with the seat tab