IIRC The Anniversary cars were supplied with a half tonneau cover which covers only the void behind the seats. The one I saw was a snug fit behind the seat backs.
Kenny - I would try the car without the cover and see how things go. A decent trimmer can then alter the cover to suit you - once you know how you want it to fit.
Adopting a full length tonneau cover (as referred to by others above) may not work depending on if the car has the "lift the dot" pins installed on the padded roll above the dashboard. The pins are usually only fitted if a full tonneau cover is supplied.
