Breather hose/tube sounds good to me. It is MB # 103 094 10 82 and lists for $11. If you take the whole hose off you will probably find that part number on it. That would verify that we are talking about the same thing.
Don't feel badly about breaking it, fifteen years is pretty good for a heated rubber product in a hydrocarbon environment.
Bosch Master, ASE Master, L1
33 years MB technician