I found a large piece of rubber matting at work a couple of weeks ago, so today i set about measuring the carpeted area under the rear seats (from the front edge of the original "boot" rubber mat to the front edge of the rear seats) of my P38. i wanted to remove the rear seats completely to make the job easier, but i couldn't find my torx socket set buried deep under all the other stuff in my E30 Touring, so had to work with the seats in situ.
measuring approximately 140cm x 56cm, i cut a template out of an old piece of carpet i had, cutting around the wheel arches and seat fixings, then the hailstone storm hit!
of course, i was working outside and all my load area contents were scattered everywhere on the ground. everything (including me) having had a cold shower, i reloaded it all and came indoors.
weather permitting tomorrow, i shall finish the template, then cut the rubber mat accordingly.
i just wanted similar protection to the "boot" area, in the rear seats area, for when i have larger amounts of stuff to cart around.