Ah Terminator 2.. same as mine.
Well, you have to mod the car! Its shocking - the mesh sticks out the back so you cant get them flush - well, you can.. but it involves a hammer! Scary.
Anyway, I dunno.. difficult to say really. Fitting is a swine tho - they never are long enough perfectly so take a bit of work. An aducated guess, would be.. £100 - £200? Maybe? Total guess, tho.