65 GT Rear End

You're all good. The trim is for a GT and that's what you have according to your avatar picture. The bumper guards are correct as well. You have dual exhaust which isn't original and these cars didn't have. There was a HP single exhaust available that came standard with the Charger 273 4 barrel engine. There was a rectangular exhaust tip and a notched valance on the drivers side only.

65 dart gt.jpg