OK. Let's back the truck up here a bit. Your tag line suggests 3rd seat installation info. Then you shotgun into sliding glass windows and then you go back to a questionable question about the seats again. Or was it a question?
Generally speaking, we slow folks here on these boards can only handle one issue at a time. So maybe if you flesh out your thoughts a bit more and focus on the issue in the title of your post only, maybe we can help you out. You've gone 2 days without a reply, so I guess I'm not the only one who's a bit slow on the uptake.
I don't understand this statement,
"Should be able to use the back seat for the 3rd and find the correct 2nd"
Is the back seat the 2nd and is it not correct?
