I have fitted stainless covers to my long door Plus 4 and a previous 4/4. It is less risky to remove the door cards, you could take half the screws out and bend the card, but that does add the risk of damaging the card. With an electric screwdriver it doesn't take long to remove all the screws, be careful not to lose the dished washers as they tend to stick to the card and then leap off when you are not looking. The covers fitted directly without leaving any gaps, however, depending on what original plastic covers were fitted, the stainless steel covers may be a tad larger than the original plastic covers and the card can be a tighter fit around the new cover.
