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I tried to install these in my 2004 Ford Taurus. They are very easy to install but after checking the polarity I found that it was reversed. I tried pulling the pins and flipping them but they are in there too tight. I ended up returning them and splicing into the factory wires to get the correct polarity. I'm not sure if this only happens on the 04 Taurus but thought I'd post this just as a word of warning.
What's great about it: Easy to install
What's not so great: Reverses the polarity / Expensive