[steamship]

Start from page 69 of the following PDF:

Service Manual General Body Assembly Interior (Repair groups 68 69 70 72 74).pdf

I haven't read through it, but (amongst other things) you need to remove the lower B-pillar trim, and in order to do that, you need to remove the front lower door trim and partly remove the rear lower door trim. That gives access to two screws with black plugs (for want of a better term) to be removed. You then need to disconnect the light source to the rear air vent in the B-pillar. I've marked where it is cable tied to. There is still the top section of trim to be removed as well.

BTW This is me trying to get rid of the swimming pool in the rear passenger footwell, so only rough photos.

I'd be interested to hear how much they cost as mine is so much worn, as disgustingly dirty. That's what happens when you wear working clothes and then proceed to drive the car with them on.