I don't know if they're still in business, but I used to go to Smyrna right off of Atlanta road (basically Marietta not far from Cobb Galleria erea) at a huge MB yard called EMBEE (that's how it was spelled) and got all kinds of parts for my 115's but they had all kind of MB's in the yard and I'd just walk out on the yard and get what I needed for decent prices. You might try 411 and see if they're still listed.
I'll look and see if I still have their number somewhere in my old phone book. Hopes this helps!
Good luck
Alan
