i assume my aftermarket headlights are similar to OEM (i never changed the xenon bulbs on my OEM headlights)..
..so if they are the same you just have to remove the protective cap covering the projector on the back; a screwdriver should do. then disconnect the wire coming up from the ballast, and the bulb should be able to be pulled out easily. Insert new bulb, attach ballast wire, and replace protective cap.

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