Are there any C600 sports out there with LED daytime running lights? every one here in the Seattle area I have seen, has regular bulbs. In the videos form europe I see LED lights along the entire height of the headlight assembly, leading me to think a stock headlight swap woulf be necessary, unless you just buy T-10 LED arrays and install (which is what I did). In fact you have to keep in mind a swap to T-10 LEDs is not that simple with a canbus system. you have to add resistors to match the current draw, in order to prevent a false lamp error. I purchased a set of SMD mounted resistors and installed to do this.
Here is a pic of W5W vs LED on my bike.
the led was listed in ebay as "error free" but did not work until I added the resistor pack on. Left is the W5W Bulb; right, LED