What type of gas tank will fit my motorcycle?

What type of gas tank will fit my motorcycle?
Added (1). Recently got in a small crash that dented my gas tank really bad. So I need to replace it but I will like to get something smaller and maybe cheaper then buying the original one. The original on is a bit to fat for my taste.( 2010 Honda shadow phantom 750 ) I would like to get something smaller. What website or where can I go to find I different type of gas tank that fits the bike. That I'm actually going to be able to install on the bike. Without any modifications to the frame. Thank

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