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I'm Paid Up...
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I'm guessing the 04,05 is injected? The fuel injection tank has a pump in it, which you wont need for a carb. But the FI tank has no petcock, which you will need. The rest should be compatible.
 

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Here's the deal,

The '04 & '05 FI and carb tanks are the same because H-D simply uses a different type fuel float setup on the carb bikes than on the FI bikes.
You can use a FI tank on an earlier carb bike by either changing to the later fuel float OR by fabricating a plate to cover the large center hole in the tank and adding a stud to the plate to secure the dash cluster. You would also have to cut a hole in the left side gas cap hole to accomodate the earlier gas guage float or simply eliminate the gas guage.
I think that when Harley came out with the FI Softails they made two different style tanks until they used up all of the non FI(carb)tanks and then simply used the same tanks on both FI and carb bikes.
 
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