paint codes

Plymouth paint chips for 1974. At some paint shops, you need to tell them the year of the car and then just the last two digits of the paint code. If you tell them all 3 digits, they cannot seem to pull it up right. The first digit actually denotes the first year a particular color/paint mix was used (after 1968). That is why Eb5 for instance is totally different than GB5. The first was mixed/used first in 1969 while the second was a 1971 paint mix.