Britax Weathershield roof parts

Hi Everybody,
I am missing the centre hinge on my britax weathershield roof sunvisor.
A real long shot . . . but does anybody have a spare for sale?
Is it the same as the 2 outer hinges, or does it have a locking mechanism on it?
Maybe somebody who has one can send me a pic so I can see what I am searching for?
Also need a new cover - who can recommend a good supplier?
Thanks in advance.