1965 Dodge Dart Charger

The DartCharger package was except the 273 hipo engine mostly a cosmetic option.
All cars were yellow, choise of white or black vinyl roof or just painted roof. The other standare option that I have found out was 4-spped or automatic transmission, radio package, outside remote mirror, front and rear bumperguards. Other options was hd brakes, hd suspension, sure grip.

The answer to you question is that the sway bay was a ootion, I think it was a dealer option but I'm not sure.