Yep as Hayesey said, the 8N is a mk2 golf box similar to the polo 8P.
If you have trouble getting an ATV, the CEK is a later G40 gearbox. Also if you don't want to pay the G40 box premium then look out for a late CEG gearbox from an L or M reg mk3 1.3 polo. These have a rivited on crown wheel with same ratios as the 8P. Double check it has the rivited on crown wheel though, by draining the oil and having a look through the oil fill/drain plugs to see the rivit heads!