Hi Tom,
I'm not sure if I would want to cut into the wiring to install one. These newer ones can get pretty persnickety if you just put the wrong light bulb in. If your daughter's R-class is the newer style (second gen), I have a set of mud flaps for it I bought on e-bay that won't work with mine. They're yours for the cost of shipping.

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Democracy dies in darkness, you have to kick at the darkness till it bleeds daylight