It won't be "just cut to length and replace". It will be either a flared brake line type or a hydraulic type fitting. The system operates at over 1800 PSI (pounds per square inch).

You would be better off to take it to a garage if you are not familiar with brake work and hydraulic work.

A good mechanic should be able to make new lines, it should not be necessary to order new ones from Mercedes Benz. A "good ol' boy" mechanic who is used to working on farm tractors snow plows and dump trucks will have no problem with hydraulics.