the dipstick you want is the super long one that doesnt fit. its just used to measure level - you cannot leave it in. Just replace the cap after the level check.

It takes Shell ATF 134 - its factory approved, cheap too. Or you can use maxlife from walmart - it works pretty neat in these boxes.

I also use ATF +4 in these and it works decent.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)