tbh mate it was 2yrs ago i had done this but from what i can remember i used the escort peddle with allen bolt adjuster it uses a black ratchet part thats fitted in the peddle. i think i welded a nut on the end of the bolt and it was the nut that pushed on the ratchet part and pulled the cable?
BUT after doing that work to get that peddle to fit and work i took it out a few months later and modified the mk3 peddle cos i didnt like the shape of the escort peddle. ( it has a slight kick to the left ) which took it to close to the heater matrix if i remember rite. if u have a welder and are a little handy with moding things its a simple job mate.