A forum member on here called Reddo had a kind of similar problem here in NSW a while back.
This is the story ( from memory ),
Bought an FE van but it had an FC subframe.
Went to get it registered with the NSW RTA.
Had all sorts of problems with the monosyllabilic automaton at the RTA counter trying to get the technicalities of rego numbers sorted out.
From memory he ended up with a 1957 FC Holden panelvan after hours of frustration talking to a robot er... ah.... I mean..... RTA customer service officer.