Beckford ensuite vent

Hi, does anyone know where I can get parts for the small lift up hatch in the roof of the ensuite in the Beckford, I assume this would be that same as fitted to Burfords and others.
Specifically I need the black piece of the handle that is depressed to open the vent. The agent here in New Zealand claims the part is not available but I am skeptical it's just a case of wanting sell me a new vent and charge me for the installation.
Thank you

A photo would help a lot.
First suggestion would be to try O'Learys.    

Thank you Dave will take a photo of the vent and send it to them 
Looks promising after a quick look at their website

If it's one of four black bits!  They are actually locks and I am informed they are not essential The roof will not shoot up.

I recently talked to a Mobile Caravan Technician who said you can get parts but in my case as only 1 had broken he didn't think it was worth stripping down

Assuming it's the same part !!

Madmac wrote:Thank you Dave will take a photo of the vent and send it to them 
Looks promising after a quick look at their website

I meant a photo for us, but sending one to O'Leary's is also a good idea. 

With the combined knowledge and experience of our membership, there's not a lot of questions that someone can't answer - but a picture is often worth a thousand words.

Thanks for your replies. Can anyone please advise how I insert a photo. Can't see where there is a tab to do this. Thanks.