you can remove that bit of the casing with box in the car, only held on with 6 13mm bolts. get down scrappy and have another one off 1.8-2.0 8v mk3 or 1.6-1.8 8v/16v mk2, good news is the clutch arm comes with it so dont need to buy any new parts assuming the scrappy one is ok. unbolt your old one, bolt on the new one with replacement gasket, job done