assuming you're LHD with a right side fork, you want the 5 foot cable, they are the last two on the Burton site,
CCESCYB1 170 cm / 5.5ft
CCESCYB2 173 cm / 5.67ft
What makes our cars made for the Mk1 Escort difficult to cable is the eyelet on the pedal end...that didn't continue on many other cars.
Also, cables from "First Line" are notoriously unreliable. if that's all you can get, get a few.
thats where they break at the eyelet.