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Are you just trying to replace the bulb? or the whole assembly? the screws you see in the front on top are for adjusting, Looking at my '97 sierra, it looks as if you have to pull the front piece (the one with the grill and marker lights, basically the nose) off the truck, two small bolts on top under the hood and possibly a few more below, to get the assembly out without breaking anything. if it is just the bulbs you want to replace, the bulb turns in the back where it connects to the wires. Simply turn it a little, and it will come out.
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