Interior Trim Codes

The interior trim color code is a 3-digit number. Those not checked under Bucket are bench seat styling.
There may be additional interior codes for Oshawa-built Chevelles as I have no source to reference.
Atlanta, Framingham, and Kansas City also included a -A or -B to denote bench or bucket seat. When optional headrests were ordered the -A or -B gave way to -S for bucket seats and -E for bench seat; Baltimore, Fremont, and Oshawa did not.

Code Color Bucket
705 Plum Royale Cloth, Antique Plum Imitation Leather (sport sedan only)  
720 Medium Fawn Imitation Leather  
723 Medium Bright Blue Imitation Leather  
724 Medium Blue Redmond Cloth, Medium Blue Imitation Leather  
726 Medium Blue Rio Cloth, Medium Blue Imitation Leather  
727 Medium Blue Pattern Imitation Leather  
728 Medium Blue Roncina Cloth, Medium Blue Imitation Leather  
729 Medium Blue Imitation Leather  
730 Medium Blue Royale Cloth, Medium Blue Imitation Leather (sport sedan only)  
731 Medium Bright Blue Imitation Leather x
738 Medium Blue Imitation Leather x
746 Dark Maroon Roncina Cloth, Dark Maroon Imitation Leather  
747 Medium Red Imitation Leather  
750 Medium Red Imitation Leather x
757 Black Pattern Imitation Leather  
759 Black Roncina Cloth, Black Imitation Leather  
761 Black Imitation Leather  
762 Black Royale Cloth, Black Imitation Leather (sport sedan only)  
763 Black Imitation Leather x
764 Black Rio Cloth, Black Imitation Leather  
766 Medium Red Imitation Leather  
748 Medium Red Imitation Leather (El Camino only)  
749 Medium Red Imitation Leather (El Camino only) x
750 Medium Red Imitation Leather x
760 Black Imitation Leather  
761 Black Imitation Leather  
762 Black Imitation Leather (El Camino only) x
763 Black Imitation Leather X
764 Black Rio Cloth, Black Imitation Leather  
766 Black Pattern Imitation Leather  
768 Medium Fawn Redmond Cloth, Medium Fawn Imitation leather  
769 Medium Fawn Rio Cloth, Medium Fawn Imitation Leather  
770 Medium Fawn Pattern Imitation Leather  
775 Medium Turquoise Roncina Cloth, Medium Turquoise Imitation Leather  
776 Medium Turquoise Imitation Leather  
778 Medium Turquoise Imitation Leather x
782 Medium Gold Roncina Cloth, Medium Gold Imitation Leather  
783 Medium Gold Imitation Leather  
784 Medium Gold Imitation Leather x
794 Medium Gold Royale Cloth, Medium Gold Imitation Leather (sport sedan only)