Cowl Break down below.. Interesting is the stamped 21 after the interior trim number.. Would love ot get my hand son that

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Style:
6816447
Year: 1968
Series: Impala Custom
Body Style: 2-Dr Sport Coupe
Engine: 8 Cyl
Body:
STL009578
Plant: St. Louis, MO
Serial #: 009578
Trim:
806
Series: Impala
Interior Color: Black
Material: Vinyl Cloth Leather
Paint:
RR
Lower Body Color: Matador Red
Upper Body Color: Matador Red