The only thing that should be different (according to the Porsche parts list) is vent line (item 2 on the bottom) and the support on top is slightly different but attaches the same way.
The outer lid lid design changed but again is functionally the same.
The photos above the diagram are from a C4S.
I see the photos above and that is exactly how my car looks. The top of the bracket where the screw is shown on the parts diagram is behind the unit. The bracket on the 4's turns down not up. Therefore there is no head of a screw that is exposed that I can see. If you look on the other si