HI turbo.
My Disco had the same problem on the drivers door.
That rubber drive thingy is there to to take the mechanical shock out of the system when the window comes to a grinding halt at the closed and full open position.
...........It is the weak link in the chain.
I had a disinterested search for a replacement and found nothing.......The complete units are available, (can't remember price).
But, being a bit of a cheapskate, I decided on a temporary fix instead of a piece of wood holding the window closed.
All the rubber drive material was cleaned out and replaced with epoxy.
Re installed and it worked.
However. It hit the down stop somewhat harshly.
I placed a rubber block in the lower door to cushion the system at window full down.
This dodgy fix was meant to be temporary until parts could be sourced.
12 months later and it's still working fine.
It's not an answer to your question, but this fix may keep you going until you find a part, or spend some dollars for the assembly.


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