The Uno Turbo seat cushions and materials are different yes. However, they have the same runners and will fit into any Uno. Louie B. fitted to a set to his mk2 Uno Start and I've fitted a set to my mk1 45S.
So yes, they will easily go into a standard Uno. They're a straight swap with your existing seats
both points are very useful, but i guess custom seats would cost a fair bit, and i don't think bucket seats are in order as they to me anyway are a bit too much.
i think standard ones should go well and not look out of place.
i shall get more pics up of my car as it progresses