@antp - yes, most were built in Belgium, but they were also assembled in Australia (from CKD) from mid 1998 until late 1999. Only sedans and wagons were ever built in Australia, all hatches were imported.

I'm actually surprised that the Holden plant had the extra capacity to build Vectras in 1998, as they were flat out building the new VT Commodore at that time, which had a record year in 1998.