I am a proud owner of a 2010 Saab 93 and after 10 years of use the black paint has worn off the satnav buttons. I have made a solution that I am now making available to other Saab owners. I have made special precision laser cut buttons that are self adhesive and they tidy up the damaged / worn buttons effectively. They stick over the existing buttons. Supplied are N and D but others can be made available on request.
The buttons have a large see through D to replace the "Dest" text and it shows the green light through the letter.
A neat and tidy solution.
Size matches existing button, thickness = 1mm

If you are interested in them please checkout my ebay by searching for "saab satnav buttons" It shows the relevant satnav model/make.