Not being funny but they're in seriously bad condition. They look REALLY worn, and in all honesty I wouldn't pay much more than 180 quid for them!!
Plus Highline seats came with rear headrests, so these are obviously missing the headrests, which means they're worth even less! So I'd say around 150 quid to be fair!
My dad paid 230 quid for black leather interior and it was in immaculate condition, complete with rear headrests!
And as for what cars they fit into, the front seats fit directly into a Mk4 Polo although I'm unsure about the rear seats.