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After some researches, I had some precision. 
[N10] for 1968-1972 Toyota Hilux.
[N20] for 1972-1978 Toyota Hilux.
[N40] for 1983-1988 Toyota Hilux.
[N50] for 1988-1997 Toyota Hilux.
[N60] for 1997-2004 Toyota Hilux.
[N70] for 2004-present Toyota Hilux.
http://en.wikipedia.org/wiki/Toyota_Hilux
[N10] for 1968-1972 Toyota Hilux.
[N20] for 1972-1978 Toyota Hilux.
[N40] for 1983-1988 Toyota Hilux.
[N50] for 1988-1997 Toyota Hilux.
[N60] for 1997-2004 Toyota Hilux.
[N70] for 2004-present Toyota Hilux.
http://en.wikipedia.org/wiki/Toyota_Hilux
These are the general codes for the Toyota trucks. There are different codes for various models (4WD/Extended cab/Crew Cab, etc.)