This question was answered previously. And when I find the thread ill combine it with the existing question.
I posted a picture of a brand new NOS SLS container that I installed on my E500 this past summer. It is in the “Top End” thread in the project journals sub-forum. You can see the orientation of the sticker as it came from the factory in the photos I took of installing this SLS reservoir.
There also may be info in @ntrepid’s SLS reservoir Group Buy Thread, as these stickers that
@captruff had made were part of that Group Buy.