Re: 363 under seat access
you are right about the buckets, that's what I have. I did find another site that gave specific instructions about the bench seats.
There are two catches at the front of the seat bottom, about 24" in from each side. Get in front of the seat and push straight back, then the seat can be lifted up from the catches. Push back and down to reinstall seats, it will be easier after you see the catches.
The seat back is held in place by plastic capped screws accessable from the rear compartment. Be sure you find all of them.
Hope this info is helpful.