Searching for the frame border names or templates of the bag item slots

[mog]

Hi all, I want to rebuild the current ingame bag frame and have problems to find information about the used Borders of the item slots. Looking for backdrop infos, texture names or a working template.
The background is working with:
SetAtlas('bags-item-slot64', true)
Searched a lot and find similar borders but not the right one.
Thanks for help.