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The internet says this pasted below.
The fenders do not seem to be the same for their different names.
I would say the OEM Crossbones rear fender is a Ducktail.
As for a Bobtail, perhaps that lacks the "curve" and is on an OEM Steet Bob.
So, I don't know what the difference is?
The ducktail and bobtail rear fender styles on Harley-Davidson motorcycles have distinct differences in design and aesthetic:
Ducktail Fender: Shape: The ducktail fender has a distinctive downward curve at the rear, resembling a duck’s tail.
2. Bobtail Fender: Shape: The bobtail fender is shorter and more rounded, giving a “bobbed” appearance.
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