Swinger...or no?

Dumb question;
So I broke down my 69 Dart's vin and fender tag and she's a low cost 2dr, LL23.
Is there any identifier that denotes a swinger?
The reason I ask is my Dart has the Swinger style door panels in it (they're toast but you can still see the pattern when I wiped off all the dirt lol, so I'm ASSuME-ing its a swinger..
Is there anyway to identify if its a swinger or not?
Thanks guys