I recently purchased several Molex ML-XT connectors (in particular the female side which is WM15989-ND). Prior to purchasing these connectors I was a bit confused about how they are assembled. I just realized that there was a video on the product page on the Digi-Key website, so I watched it. I did not realize that I also had to purchase the WEDGELOCK for this assembly. This is the small green part that is assembled to the mating side (the side with the double-lipped seal) of the female connector.
So I am not looking at 2 different WEDGELOCK part numbers, WM15981-ND and WM11144-ND, and I have no idea which one to purchase. They look identical.
By the way, these connector look GREAT. This is a great looking product!