Tank swap for nighthawk

[winnshwe.vertley]

I've got a 83 nighthawk cb650 I'm looking to get a different gas tank for. Something a little more narrow. What would you all suggest. I was thinking of going with a cb450 or 550.

 

[VonYinzer]

Does the 650 have a triple backbone like the 750?

 

[winnshwe.vertley]

I don't believe so