I am almost complete with how I want my overall look of my trunk to be. I received my new battery tray cover and mounting clips, thanks Blunt. The current mounting clips have the tab so you can use your fingers and the new ones have a slot for a flathead so they don't stick out as much. This is not an issue for the clip on the top, but the 2 bottoms ones would once in a blue moon, come off due to something hooking on them in my trunk.
Here is the before. It wasnt bad, I just wanted the broken tab on the right near the floor carpet back. Notice the clips

Here is closer look at the 3 new clips on the left and the old ones on the right. These are used for the headlight trim panel also. Might be preferred and easier for others to use your finger to remove versus a flathead screwdriver.

Here is the new cover installed. It does not have a hole in the bottom center to lock the storage tray with it. Better for me.

I then added some of the grip liner under the storage tray to prevent sliding, as with new plastic, everything is smooth and it did slid.

Here are both items together for the finish product. Now off to another idea I had to complete the look of the trunk.

Also, I ordered an AC belt from BMW since it was 885mm in length, versus the standard 890mm we receive when it was ordered. The item did have the BMW logo on it but it was made by ContiTech, which is the same brand as my 890mm belt. I couldn't get the right amount of tension with the longer one as I would have the hex bolt at the bottom of the pulley as tight as possible. I would still see a little wobble on the belt travel and it would be noisy sometimes. So if you want the tighter belt on your m42, the tirck is to get the smaller one from Contitech. The issue is going to be to find it but it should be hard. Just there is no BMW part number to use unless you get the belt directly for BMW.
Here is a pic of it:
