I need to remove the cargo floor in my 79 malibu wagon. Well the top floor, not the lower one that has the spare tire well in it. What needs to come out to do this? as far as I can see it looks like there are just the screws at the rear near the tailgate and the ones near the rear seat, but are there ones under the side panels over the tire wells also? Or do the side panels need to come out anyway because of overlap? Thanks