i have a 96 C280 that is giving me problems with backfiring adn rough idle, i was told to replace the coil wire resistor ends. If i am correct these are the three long connectors that go over the 3 spark plugs on the top of the engine in the cavities, which get water in them adn go bad, which is what i think happened. Anyways i was told these were cheap but on fast lane i can only find the whole kit for 3, not just the ends that go on the plus which is all i need. HELP IS NEEDED... thanks