The fitting is from the factory just like the one pictured. It is highly unlikely that you will be able to just replace the fitting and not the lines also.
The part numbers for the lines appear to be A 123 420 72 28 and A 123 420 74 28. You would need for these to be looked up by VIN to be sure.
It's also very possible that the other end of the line to the rear is just as rusty as the one in your picture.

Good luck, Robert

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Mercedes Benz Master Tech - Retired