Bear in mind Paul, that a tonneau cover from another 4 seater may not fit 'properly' because the body fixings will be in slightly different places. Also if a car is not specced new with a tonneau cover some, (maybe all) don't get fitted with the dash top fasteners which means that the screen frame has to be taken off to fit the fasteners to the car.

DaveW
'05 Red Roadster S1
'16 Yellow (Not the only) Narrow AR GDI Plus 4