The part I am talking about is not the boots
It is the Resistor Connector that goes under the coil and connects the coil to the plug. No wire or boots , just a connector/resistor...those are the ones that go bad and cause the mis-fires.
They do not come with the wire set unless you get the complete set.
Boots are the covers at the coil for the wires to the other 3 plugs.

http://catalog.worldpac.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=21H0MN3YU21R1A0NBT&year=1995&make=MB&model=C-280-001&category=F&part=Ignition+Wire+Set

As you can see the first set includes the connectors ...a standard ignition wire set does not. I see many guys who say they have changed the ignition wires ,,but they unknowingly have not changed the coil connectors [ which was the problem all along] ......... that is why I specify.