Petty blue??

The light silvery blue is EB3 aka Light Blue Poly in Dodge and Ice Blue Poly Plymouth. It was first offered in 1969, hence the prefix "E." It was only offered in 1969 & 1970 and could be had on any body style not just B-Bodies.

Basin Street Blue AKA Blue Streak AKA Petty Blue is TB3. It was first offered in 1966 as a "999" special order color and did not appear as a regular paint code until 1972. The thought is that it got a "T" prefix because the mix was made up sometime around 1963