I found a pair of Euro market OE tail lights on eBay from a UK salvage for $145 shipped.
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They included the bulbs. The red lights are LED, the reverse light is the same 921 bulb as our USDM tail lights, and the amber signal is a PY21W just like the Euro projector headlamps use. I swapped out the reverse light for an LED and the amber blinker is an Osram Diadem Chrome bulb.
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The connector on the Euro assembly is a Yazaki 6-pin male, but our USDM assemblies use the female version of the same plug. I built a conversion harness so I could switch back to stock if I ever wanted or needed to. The
connector kits can be found on AliExpress for a few bucks.
Other differences include the US wiring harness with an integrated molded-on rubber grommet.
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The Euro tails have a foam gasket of sorts that surrounds the entire assembly. There is also a threaded peg in the center of the Euro assembly that looks like it is used to secure it to the body via a plastic thumb screw.
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The whole thing can just be unscrewed from the housing.
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I slathered on the dialetric grease to help mate the foam gasket to the body to prevent that now-exposed wire opening from water intrusion, but judging by the imprint on the body I think I need to come back with some additional weatherstripping and/or some RTV to seal off the area.
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Here's what the running lights look like in the dark:
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