The OEM unit has two metal "tabs" that run down from the unit and mount on the pre-existing bolts of the seat bumper (inner - closer to the center console). You simply remove the plastic protective caps that cover the 10MM nutes for the seat back bumpers and loosen the nuts. You then slide in the OEM unit and retighten the nuts and replace the protective caps. You should see a small notch in your seat bumper (assuming you have an 05) between the seat bumper and the rear wall. That's the gap where the bracket for the unit fits into.