I saw that on eBay too!
Technically you can fit whatever front seats you like into any car you like, you just need to make some brackets to bolt the seat to the runner. I usually just go to my local scrapyard and take a look around to see what I like. Alfa Romeos always have good leather seats. (I had alfa 156 frontseats in my old 240)
Ive never changed rear seats though.
Ive done this a few times with various cars. I fitted Rover 620Ti seats inyo my dads Ford Escort mk1, Afla 156 seats into my old Volvo 240 and mroe recently a pair of Rover 820 Recaros into my current 240.
Its not a difficult job to do, just time consuming to make sure your brackets are right.
Heres some pics of my Recaros in my 240. The back was a bolt on affair but the front required a bracket making to bolt the seat to the runner and keep strength:
Good luck. Youll be able to mock up something Im sure
