If you look at the FSM to clear the drains - you will see that one tube is shown literally hanging near the upper edge of the trans pan. I used some foam tube I found in the recycle bin at work when I was dumping a printer. It was just the right width.

__________________
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)