as far as the lap belt goes im sure you know you can just mount it where the stock one went. im by no means an expert in this field but from a practacle stadpoint..if i were involved in this project id recomend attaching one end of the shoulder harness to the rear seat bracket and bringing it up over the seat. of course youll have to measure it and if you have one of those spring loaded return boxes for it you might have to make a bracket to give it enuff clearance. just a thought.