As promised, here is a picture of the trunk mat for my i5. It fits perfectly between the back seats and the rear of the trunk, and also perfectly side to side. Very durable feeling rubber material and I like the look of it too. The reason I finally decided to get it after about 7 months is because of the wear the trunk floor was getting from the organizer box I keep in the trunk. The organizer box has velcro on the bottom which grips the trunk floor well, but the fibers are starting to show wear more than I like. Now, I'll just sit the organizer box on the rubber mat and all will be well.
The organizer box I'm referring to is one like here:
https://www.amazon.com/gp/product/B0...e?ie=UTF8&th=1
I think because the i5 trunk floor is a little higher than the ICE 5 cars, it is slightly different in size, thus a different part number.