Passenger window stuck in down position

[BX5]

Hi,

Just like many others, I just experienced the 'Window stuck in down position' problem on my 2005 X5 4.8i.
With the help of this how to article, I got to the door's interior and was able to get the window up a little bit with by pushing from the bottom.
Now, it looks like that the plastic 'slider' is broken:
Picture , Video

Do I have to replace the entire Window lifter (#1, 51338254912 in this pic on RealOEM) or is there a way to just replace that slider?
Also, while I'm in the door, are there any other components that are prone to fail and should be replaced at the same time?

Thanks!