Hello, I did this conversion a couple of years ago see my thread " st170 number 2 and 3 "
You will need the complete gearbox including mounting brackets, drive shafts, bearing support, flywheel, flywheel bolts, clutch, gear lever and cables from a mk1 focus 2.0, I can not remember if you also need the hydraulic pipe for the release bearing.
After the conversion the speedo will not work correctly, I did purchase a corrector module but did not fit it so do not know if it works