Yup he is correct, the original gearbox I had on my 99 AGU was the old style connectors. It is pretty much a gearbox from the mk3 on the very first mk4s.
You will have to spend lots of time fiddling about with the adjustment, and possibly buy new plastic/rubber parts for the shifter mechanism to remove any slack.
Alternatively you can buy a newer shifter mechanism with newer connectors and the appropriate shift tower to go with it. It is pretty easy to lift out the shift tower from the gearbox however you have to remove the exhaust to replace the shifter mechanism