Hello there I just joined today. According to Chevy by the numbers book MM for 66 Impala is Aztec Bronze. NN for 65 and 66 Impala is Madeira Maroon.The 65 Corvette paint code MM was Milano Maroon which was a Vette color only.then in 66 the Milano Maroon Vette code was changed to 988. my first new car was an NN Maderia Maroon Impala in 65. Am now restoring a 65 Impala SS 327 250HP with PG . also has original PS.PB.(putting on front disc)Tilt wheel,PW.Manual Left remote control mirror,rear window de-fogger and AC.and white interior , it was built in(code NOR) Norwood, OHIO not at NORWOOD ,CALIFORNIA as some books say. IT's original color was HH Willow Green, But i will be painting it the 65 Corvette MM Milano maroon.