all right drive trucks were originally partly assembled in Canada for export - I believe yours would have gone to Holden in AU, then on to NZ, so the reg numbers you have are more likely Holden than GM Canada
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics