Toyota supplied Holden with different grille options... that's why the nova's have a FX type grille... they also come with factory tinted rear lenses, series 1 anyway...
I was a very happy kid the day I worked out my nova was a toyota, and then I found out about GZE's...
The equivelant Holden nova was 2k odd cheaper than the same model Corolla... Holden gets toyota parts in for you cheaper than getting them from Toyota...