These bulbs are a great improvement over factory bulbs and the fact that the diodes are adjustable is very important. Once installed in the case, look at the logo and rotate the case until the logo is at the top. That's all. The 2007 Yukon has 3 body bolts and one is under the fender. Remove all of the screws at the top of the grille and you should be able to slide the case out.
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