Corsa-B.uk - Vauxhall, Opel and Holden Corsa B Owners Club

When i bought the car i noticed it had the wrong back box on it, am i right in thinking that the 1.0 12v had the triangular box on it and the 1.2 8v onwards had a circular back box? This being correct is it possibly that my middle pipe is also incorrect and that it's causing my new ashley back box to sit incorrect?

im pretty sure its just the backbox thats diffrent, the middle pipe i think is the same on all corsa b

yeah 1.0 12V have triangular mate