68 Hemi Dart quarter panels...

Hey...lo Moparites.

I'm curious to know why are the rear quarter panels on the Hemi Dart different on a few cars ?
Where these all from the factory as they tend to show now-a-days. Slicks fitting in the rear add if they were made to accommodate 11-12 inch wide slicks and rubbing etc.
Were they"cut" by Hurst or did the factory send them out like that ? Better yet, if from the Mr. Dodge's Homebase of factory line production where the 68 Darts (340 383,/6 etc) fitted with the same quarters ?

Thanks.
MAPS