What is the bolt at the too of thd fuel tank?

[Tubz1983]

I need a replacement bolt for the very top of the fuel tank where it fastens to the top of the frame (just under the handle bars/yoke)
No idea what it is called though?! Any links to a seller or Ebay listing? 

[darrsi]

https://www.ajsutton.co.uk/genuineparts/...tank?uID=0

[bandit]

M6 bolt of suitable length with a washer.

[Tubz1983]

Hmmm there not very long from what i remember

[Disorderlypunk]

m6x40  hex cap head in mine if i remember rightly -obviously replaced