The Car/Chassis number on Australian Built Vehicles forms part of the wider identification plate attached to the valance on the right hand side, and looks like the following:

Prefix Group 1:

CodeCountry
YAustralia

Prefix Group 2:

CodeModel
AAustin
GMG
HHealey
MMorris
WWolseley
KMorris Cooper

Prefix Group 3:

CodeEngine Model (and capacity)
LUp to 799cc
A800cc - 999cc
G1008cc - 1399cc
H1400cc - 1999cc
B2000cc - 2999cc
D3000cc up

Prefix Group 4:

CodeBody type
N2 Seater Tourer
T4 Seater Tourer
S4 Door Saloon
2S2 Door Saloon
WStation Wagon
XTaxi

Prefix Group 5:

Used to record major change.

CodeModel/Series
1Morris 1100 Deluxe
2Morris 1100 S (1275cc)
3Morris 1100 Automatic
4Morris 1100 Standard
5Morris 1100 S (1275cc) Automatic
10Morris 1500

Examples:

YHS10 – Australia, H Series Engine (1500), 4 Door Saloon, Morris 1500.

YMGS3 – Australia, Morris, 1008 – 1399cc Engine, 4 Door Saloon, Morris 1100 Automatic