EJ and EH Body and Engine ID Codes explained 

From a set of numbers we can establish some of the history of your EJ or EH. It is all relative to the amount of info you have. I will go through examples and explain what they mean. First of all I will start with the chassis number it is NOT the little tag below the BODY ID tag. It is found stamped in the engine bay skirt panel on the drivers side. A typical example would be ‘EH12345M’. The first two letters will state simply whether the vehicle is an ‘EJ’ or ‘EH’ .The numbers that follow indicate the number for that vehicle off the line at the plant it was built and/or assembled at. The chassis numbers started at 1001. This brings us to the final letter, which will be either 
 – Adelaide
B – Brisbane (assembly only)
M – Melbourne
S – Sydney
P – Perth (assembly only)
NZ – New Zealand (assembly only)

The codes as shown on a sample Body Identification plate below are explained as follows. The small plate with a number on it below the main Body ID plate is a stock number. 

The BODY code on this plate holds most of the information. A typical example would be ‘EH 225A-1001M’ and can be broken up as follows.The first two letters will state simply whether the vehicle is an ‘EJ’ or ‘EH’' amp;a Q Id A China Mailed Avvo 'novelty Said That I From In  The next group of three or four numbers will indicate the body style 

215Said 'novelty Mailed I Avvo Id ' Q That In A amp;a From China  Standard Sedan 
219 Standard Station Sedan
225 Special Sedan 
Museum amp; Vacations Florida Stonewall Fort Archives National ZqUTpcW5w4229 Special Station Sedan
235 Premier Sedan 
239 Premier Station Sedan 
2104 Panel Van 
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2106 Coupe-Utility 
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The ‘M’ or ‘A’ that follows indicates Manual or Automatic

The next group of 1-5 numbers is the number of that vehicle bodystyle off the line at the plant (including assembly) concerned in the last letter.The last letter indicates the plant that the body shell was built at. Bodyshells were built at these three plants only. Final assembly was done at a number of plants. This number starts at 1. 
 – Adelaide
M – Melbourne
SChina A That In amp;a Q Said ' 'novelty Mailed Id I From Avvo  – Sydney

What about S4?

I That Id Q From Mailed amp;a Said 'novelty ' China A In Avvo There were quite a number of special build codes and from time to time they are seen to be stamped for obvious reasons. S4 is definitley stamped on the S4 model EH’s, but has been seen stamped on other seemingly standard models as well. Other codes like s7, s9, s12 also pop up from time to time. It seems a couple of ex-railways panelvans have had S12, but what difference this means in actual build of the vehicle we are still not sure. 

The Trim code is in two parts and the first part which is 3 or four digits indicates the paint scheme used. The second part starting with ‘B’ or ‘C’ followed by two digits indicates the interior trim itself.