If I may advise (just been through that) - consider buying it from the dealer, A 111 826 51 97. This is as of chassis 10650.
There is a similar seal for the trim strip above the licence plate. This one I bought from SLS (NLA in MB) and the fit is not so great.
For reasons I do not remember, I did not use the seal for lamp on that trim piece, perhaps it was different...