I thought I'd try some 'improved' headlight bulbs in my W204. They made almost no difference, and one failed almost at once. Ho hum. I went to put the old ones back, and realised I'd forgotten to put the covers at the rear of the unit back on and they had, unsurprisingly, disappeared. My nearest MB dealer is 90 miles and a 2.5hr round trip...can I order this sort of thing online from anywhere?