This is the main wire electrical harness?
If it is,this is only an educated guess mind you, but I would think it would work. I do not know if MB would create a bazillion wire harnesses for this model, it seems silly to to do that to add only a few more speakers.
Do you happen to have a part number? maybe you could check with the sponsor's web site to see if there are multiple part numbers for this harness?
One other thought, could you post a picture? If I saw it I might be able to help a little more.
Sorry for the questions, but saying "yes" would be speaking out of the wrong cavity of my body without more information.
