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There will always be decrepencies due to early or late year model, left over new vehicle sold the next year and lost plates that were replaced, but there is a sequence to California commercial plates. Commerical plates used only one letter, car plates used 3 letters.The new (yellow on black) 1963 plates, began with A on the left side.There were many different letters for 1963, because many older 1956 thru 1962 plates(black on yellow) were exchanged Generally 1964 was around N or P, 1965 around R or S or , 1966 around T or U, 1967 was V or X . Y or Z may be early 68 models. After letters were exhuasted around 1968, The letter A began on the right side. A and B around 1968, C and D around 1969, F G around 1970, H and J around 1971. L and K around 1972( plates now changed to blue with yellow letters). This is what I have observed on pickups with period plates 95% of the time. Remember commerical plates have only 1 letter during these years, multiple letters (3 letters 3 numbers are car plates).