You will need pretty much everything for the gearbox if your doing ib5 to st170 box I.e
St170 clutch and flywheel (unsure if normal 2.0 ones will work)
St170 gear lever and cables,
St170 torque link (rear mount/engine steady)
St170 main gearbox mount both parts
Probably and st170 starter althought a normal 2.0 starter may fit?
St170 slave cylinder/release bearing
You may also have to do something with the clutch pipe depending how it lines up
St170 gearbox bolt holes will line up with 2.0 zetec holes