I have looked at that accessory for months now, and I like the idea of something covering the inside of the top of the trunk lid. I have not seen the pictured GM version in person, but it looks like it is gray or charcoal--about the color of the hood liner. My car has Brownstone carpets and I put a Brownstone Lloyds Mats (silver StingRay logo with silver Stingray emblem) on the trunk bottom. It is excellent quality, plush and fits perfectly. I looked at Lloyds Mats online and they did not offer a trunk lid liner. So, I emailed them to see if they had one or would make one for me. That was a couple of weeks a ago and they have not responded. I will probably try to reach out to them again. I was very impressed with the quality of the trunk mat. Actually, it was nicer than the "premium" mats that came with the 3LT. BTW, I got the trunk mat from RPI (a forum supporting vendor), as I recall.