I think you will need the series three bell housing and clutch, a grown up will be along soon to advise. Pop an introduction in the say hello box before the natives come along.
Also, be aware that the Series 2 style crossmember will need to be modified to fit the series 3 clutch slave cylinder. I recently found this out the hard way.
Is it a 200tdi your fitting? You can use the 2.5 bell housing with a series 3 clutch if so. You need to counterbore 4 lower holes to accept new bolts through the bell housing to the engine block.