After spending a few hours tracking down a problem to a cracked fuse in my car one day, I bought one of these:
Fuse kit upgrade
from Mercedes Source
Much nicer than the factory OE.
As I recall I wanted a few extra for spares and he threw them in. It looks like now the 124 kit has more fuses than when I bought them though.
Probably find the same thing cheaper elsewhere too, but this guy's an enthusiast with good service. I bought the dash light upgrade kit from him too which was a nice mod.