The vehicle tool kit can be found in the stowage well under the cargo compartment floor.

When they leave the factory, vehicles without a "Minispare" emergency spare wheel are not equipped with the tools needed to change a wheel, such as a jack.
Country-specific differences are possible.
Some tools for changing a wheel are specific to the vehicle. You can obtain tools that are approved for use on your vehicle at a qualified specialist workshop, e.g. an authorized Mercedes-Benz Center.