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The 2009 Mercedes Benz C300 requires an H7 bulb for both its low beam and high beam headlights. A single replacement bulb can range in price from $10 to $25, depending on where you purchase it. It's recommended to opt for the higher-priced bulbs for better quality, as this is not an area to skimp on. To replace the bulb, you'll need to open the hood and then remove several bolts on the headlight assembly. After taking off the cover, you can then switch out the bulbs.
The size of the headlight bulb for the 2009 Mercedes C300 is H7.