[Mg-t] Body plate graphic

[wbeech at flash.net]

Hello list,
 
I am new to MG so please pardon some of my ignorance.  A friend just brought
me his 1953 TD that has been sitting for 10 years, after a re-spray and
freshening.  As I go to look for the odds and ends to get him back on the
road I am trying to understand the meanings of all the notations on the
plate.  Is there a web site that shows the plate and explains the meaning of
the numbers and which number is most commonly used, in what I would call,
the VIN number?
 
Here is what I have:
Body Type: 22381
Body No.:12643/82584
Car No.: 13271 EXL/NA
Engine No.: XPAG/TD2/LHX 13836 (believe this has a new engine as there is a
Hexagonal plate on the lower block that reads: Motor No.: 24090
 
Any assistance or direction would be most helpful.  
 
Thanks in advance,
Bill