The Three Chargers
Found a pretty good shot of the three Chargers used in the filming:
http://igniteeye.up.seesaa.net/image/dm-cl-dvd.jpg
The top Charger is a '69 non-R/T car (note the standard "Charger Arrow" in the grille).
The middle Charger is clearly a '68 R/T (note the '68 grille - whoops!)
The bottom Charger is the '69 R/T (note the "T" in the "R/T" emblem in the busted grille above the driver's turn signal)
Since the '69 R/T was the "damage" car, along with the '68 (with the '69 tail panel filler), it's possible that the top Charger is the car that eventually survived.
"What am I gonna do with 40 subscriptions to 'Vibe?' "