Seeking part for Trident

I have a 2005 VW Trident in white.
Somehow the right hand part of the top exterior vent on the offside of the vehicle as gone astray.
It covers a vent for the gas hob I think.
Apart from auto sleeper themselves does any one know where I may source the vent section from.
Regards.
Andy.

Do you mean the white plastic winter covers for the grilles or the actual vent grille itself? The winter covers are held on to the grille by a white slotted fixing that is easily turned with a coin, one vent for the cooker and one for the fridge. There are several different models available. Covers cost about £15 a pair.

They are made by Dometic and are regularly available at the usual caravan and camping suppliers or Ebay. Here's an example of the complete vent, winter cover and fixing:

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