The Charger 500 was Dodge's first-pass NASCAR aerodynamics fix for 1969. The 1968-69 Charger's tunnelback rear glass and recessed grille were aerodynamic disasters at superspeedway speeds — Ford's 1968 Torino Talladega was clocking lap times the Charger couldn't match. Dodge's response: take a regular Charger body, install a flush rear backlight (taking the glass out of the tunnel), and install a flush A-pillar grille (cribbed from the 1969 Coronet) eliminating the recessed grille entirely. Both modifications were done by Creative Industries (Detroit) on Hamtramck-built donor Chargers.
Production: 392 cars — the NASCAR homologation minimum was 500, but Dodge negotiated counted-car flexibility. 67 carried the 426 Hemi; the rest 440 Magnum. The 500 still wasn't enough — the Talladega was faster, and the Daytona winged-car program was already in development to leapfrog Ford. Only the 1969 NASCAR season ran with the Charger 500 as Dodge's lead aero entry.
Body code XX29. The XX prefix marks the homologation variant on the broadcast sheet and fender tag.