How to identify stock gas tank

[jeflon]

A fuel tank came with my project 75 xs650 and has been painted multiple times obviously. Is there a way to identify whether this is a stock yamaha xs650 tank? are there particular dimensions, or markings on the bare metal i can look for, petcock mounting holes, etc...

 

[650Skull]

This thread will helphttp://www.xs650.com/forum/showthread.php?t=39650

 

[gggGary]

Put a couple of pics up here we'll probably be able to give you the poop.