Hi Mark, just back from being away a week.
Interesting to read your outer was 9mm too short, and my outer was 9mm too long!! I wonder if their stock has got mixed up!?!? Mine came from Cristine Gradisch trading as http://www.oldtimer-teileshop.de
I bought a set of five cables (both brakes; clutch; throttle and choke) for the ES125. Inc. p&p from Germany £19.10p. It’s possible your throttle cable would have fitted mine perfectly, and visa versa!