Need some help to get a box eye fairing.

[70s kid]

Hi all.  As the title says I need some help to get a box eye fairing.
Visited my local yamaha dealers (John wren) in Barrow in Furness
To ask about the possibility of him ordering me a blue box eye fairing.
This is where the help I need comes in to play. I need the chassis number
Off a blue box eye so I can order my new fairing. Can anyone help me
Please. 70s kid (Paul).