Paul
Your rear seat base is secured by 2 Allen Key bolts that go through the back of the base.
Drop the seat back down and you will see the line of studs in the leather. Lift them up and peel the leather back and you will find the bolts.
Once they are out pull the base forward and lift out in a scoop motion under the seat belt bolt.
You will then see the battery. shock absorbers, axle, springs etc and it is easy to work on.
I replaced the rear springs, battery and U bolts through this aperture.
When you replace the base make sure the front is located in the cross rail. You should not be able to lift it, then bolt up the Allen screws.
