I had the same problem about a month ago. I came to this handy dandy forum and found a post from someone else that said:
I got mine from the autohausAZ, part # 9391KY Stabilus-Boge for $64.13 U.S. with free ground shipping
I went out there and ordered this one. It is an exact replacement. The only difference is the original had a MB star/logo and this one had the info scratched off but is was an exact duplicate. I have not installed it yet but everything should match.