I think some of them look ok, especially with two smaller headlights like the Buell Lightning.
That said I also think that in most cases it is because someone crashes the bike and doesn't want to pay to buy all the new fairings, so if you really would want to do this then I would say find a wrecked bike or use an older bike. If you take the fairings off your bike you will notice that there are some tabs and indentations along the tank that would make it obviously out of place.
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