My driver's door window pops out of the track when it get to the top when closing it. I opened up the door panel and looked inside... Found the problem. The white plastic guide that runs along the metal channel is worn out on the top contact side. Apparently whatever lubricatin that was there is gone. So now when the window goes up it pops out of alignment and doesn't stay in the track. I have a mickey-mouse workaround to get the window completely closed, but it's very annoying. So, I would like to replace the necessary parts, but I have no idea what they are called or how it comes apart. I tried searching for this in the forum but I haven't found anything describing this. Could someone tell me what this part is called and how the hell it's supposed to get replaced?