I gave up and wrapped mine.
The slightly-matt finish of the wrap is harder wearing and less Liberace, so I'm happy.
There's literally hundreds of different patterns available, I just happened to go for Burr Elm. The W164 interior could certainly use some "humanising". The brushed aluminium and Piano black only add to the down-market utilitarian feel, so it had to go.
All IMHO, of course. You could always use a wrap that looks like the original....
Did this 3 years ago and it still looks perfect. Total cost for the vinyl wrap was £10(!) on ebay.