AMS 2 Pro manufacturing variants

I know of at least 2 variants of the original AMS, and now I’ve run into 2 diffrent variants of the AMS 2 Pro. The AMS 2 Pro that I own has 4 support ribs on each side, between the inner and outer body shells. One user sent me pictures of his that has 6 ribs on each side. Anyone know if this is a difference between OEM factories or a quick model update? Anyone aware of other variants?

This came up due to my Multiboard AMS Shelf model not fitting a user’s AMS 2 Pro.

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I cant add much other than Chat support has told me that one is SA007-US ( [6 Ribs] that came with my H2D) and the other is just SA007 (3 ribs)
deffinetly frustrating.

I Have just bought 2 AMS 2 Pro’s and both of mine are different one has 3 ribs and one has 6 ribs, both ordered together.