Will these headers fit?

forphorty said

Mine fit . no problem. 72 Duster 318 904 . v8 k member. manual steering and brakes.

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Do you know if there are differences from 72 to 73? The tech support guy from pertronix told me it will work from 67 to 72, but not not 73 and up and they don't know why. Kind of weird.