When you fitted yours did you weld plates either side of the sills? I've been looking at a few cars and some have plates on the underside...some don't. I don't have my blue book to hand at the moment.
I fitted mine inside. I know what the Blue book states, and i'm not arguing that point, but in my eyes a plate on the inside offers a better solution, and in the event of a roll over the plate is being pushed down into the floor and inner sill panel - so stronger (IN MY OPINION). Also, although the rear bin makes life a little harder, welding plates inside is easier as you are welding downwards (although if you have a spit then the same could be said for outside).