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It depends on how picky you are about fitment. The esky light doesn't match the shape of the yukon glass. I'm facing this issue. The esky light base has a pretty rounded off shape under the light lens. It doesn't match up unless you really work it and press it to match the shape of your glass. Also the holes for the screws under the esky base don't match the holes in the burb and yukon XL hatch glass. After finding all this and not being happy with the results I was getting with trying the get my esky assembly to play well with my yukon XL hatch glass, I decided to go the route of swapping hatches. I'm currently looking for an esky hatch. Not easy to find but it'll be better for the mod in my opinion so the screw holes line up and I can screw it in and match the rounded shape under the base. So far no luck finding a hatch to swap with the correct style.Ok so the you only need the esky third brake light assembly if you have a newer style rear glass like in the 05 and 06 yukon denali xl??