Not sure what kind of car you have, but anything later than the W124 and W126 have some suspect quility taillight bulb sockets. Do a search and you'll find a tale of woe....

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles