Short ribbon cable that goes from the mouse button. Is that right?
Mine are U9E
While Apple considers this Vintage the Apple Depot repaired this MacBook 6 months ago including replacement of the Top case and Ribbon Cables. Fore details go to
I just want to make sure that I understand you correctly. The brown Top Case to Logic Board Ribbon Cable in your link looks exactly like the one in my MacBook. The numbers match those in the picture. There is another brown, short ribbon cable that goes from the mouse button to that cable. Is that the one you say cannot be replaced? There does not appear to be a way to do it. The one in my MacBook is folded over itself just before the point it goes under the metal cover for the track pad. Is that the proper orientation? The fold looks to be sharp and a likely place for it to tear.
Is this a good question?