Is there a larger tank on the market that will fit onto a 2011 Nightster without too much alterations?  The current tank is the stock standard 12.5 litre, I wanna aim for (at least) a 17 litre tank.

 Never gave the "1200 Custom" a thought, but I've just looked up the specs and.... bugger me...... it has a 17 litre tank on it. Now I need to know if it can go on the Nightster with out too much hassle, and that way I won't have to butcher the original 'peanut tank',  cheers Beagle. 

1200 custom tank bolted on wifes nightster no worries ! 

Cheers Blinkers

 That looks even better than I'd imagined it to look like. I had these visions of a wee Nightster hiding under a massive fuel tank... but that looks real f#$% good... thanks for the photo, Blinkers.