Hi adyh, I had the exact same problem with my rear drivers side electric window. But now fixed.
The part you have bid for on ebay looks about 3 quarters complete

The ebay photo show the regulator and motor which is OK, but seems to be minus the steel bracket which both holds the window glass in place and secures it to the regulator cable.
I had to buy a regulator unit from VAG, but it came minus the window motor but with the window bracket. This was ideal as my window motor was working fine but the bracket was broken. As you probably saw when you had the door card off, this steel bracket is held on to the regulator cable ferrule by a flimsy plastic attachment. In my case, this plastic attachment had broken, causing the glass to drop inside the door. But the motor still worked fine, it would take the glass down with it but would not lift it up again.
Is the your steel bracket holding the window glass broken in the way I have described above? If it is, then you need this part. VAG only sell this as one piece with the regulator (£49.50ish inc. VAT), motor was sold as a separate item. GSF only sell motors/regulators for the front windows

Luckily I still had the old regulator in my garage and I've taken a couple of pics for you, to see if its any help. But I'm relatively new to computers/internet and not really sure how to add them to this post. However I will try and have a go, In the meantime I hope this helps

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Phil.