Is there a larger fuel tank that can fit on a 2013 SB?

 

You wanting to go an extra 50 miles or just like the look? Aren't they almost 5 gallons? The touring line has a 6 gallon tank, not sure if they gain the extra gallon by height width or length.

 

The stock tank is 4.7 gallons. Was hoping there was a 5 or 6 gallon tank for it.