Hi Dave, Sorry I didnt get back to you. We are up in Yorkshire for a few days and I had left my phone on charge in the hotel room.
I seem to recall that my spare was not an exact match to the original down to the last mm but generally, with that spring loaded tensioner, you should be able to get away with a few mm either side anyway. Incidentally, when i bought the spare, i drew a sketch of the routing on the packaging sleeve and keep it under the passenger seat.
Pleased to hear you succeeded with the repair and Monte performed well at the Combe.