I bought that same cable from the UK last summer. I should have sent it back. There are some earlier posts on here when Paul, the forum member from France was seeking help with his speedometer problems. I posted a couple of pics and commented that the UK one was also meaningfully longer than original one. As I recall, Randy ("oneoffive") commented it was long enough to fit a mustang!
If you can get your old one apart and adapt the end to the UK cable, please let us know how you did it. Also, I seem to remember seeing that the CAT Parts warehouse at one time also had the cables. A reliable source I would say and great likelyhood it is complete and will bolt up correctly at both ends! Cheers, Gene