Well, since all of the products out there are darker than I wanted..
Take a spray gun, and get some black paint, and some clear paint (like the small cans of rustolem). Mix them, and do test sprays, until it is the desired darkness. Then, spray the taillights. Be sure to hit it with multiple layers of clear for protection, and so they are glossy.

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-Charlie
1996 Explorer Sport lifted
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There's a place I know about, where the dirt road runs out, and we can try out the 4 wheel drive..come on now, what do you say?
I've got the perfect place in mind, it's in the middle of nowhere, only one way to get there, you got to get a little mud on the tires.