Cspracer: the purple car pictured is a Coupe: B-pillar and tip-out quarter glass; aka RM21 (Plymouth) or WM21 (Dodge).
RM23 and WM23 are Hardtops, no B-pillar. Those 4 digits are what their VINs begin with.
V-code = 3x2 carbed 440s, called "440+6" in Plymouths and "Six-Pack" in Dodges.