The sports seats in my 500 TA+ were excellent.
I have a 1.2 easy, and recently spent 15 hours in mine as both driver and passenger and didn't find the seats to bad.
We are both an odd shape, obviously. Hahahaha
You might consider trying this with the seats from a Panda 100HP??
I agree. The seats in my 85 lounge are pretty good. Better than my previous car (Citigo) which had my back aching within 30 minutes of driving. The Panda's seats are much more supportive.I think the (85 Lounge) are not the worst/best seats i have had in a car, but i reckon they are mid-range seats.
I'm 6.2 and can live with them on short and up to 800 Km drives.
Don't know how they will do on longer then 800 km (400 either way on 1 day) drives, not yet drove that far.