Since your new let me give you a very helpfull fyi.
You can't get many MB parts from any of the chain stores Autozone, Pep Boys, Car Quest, Napa, ect, ect. Most of your local ar parts stores are also excluded unless they deal with Euro cars.
The handfull of parts you can get from the above mentioned stores are of poor quality and high price.
You can get parts from online sites like this one, and the dealer.
Now that you are a MB owner chain stores are good for three things cleaners, rags, and oil.