Window concertina ventilation things

I have seen loads of cars with these, Im not quite sure what theyre called or where to get them, ive only managed to find ones that are advertised for dogs and are plastic.
Anyone able to help? loads of people seam to have them at shows but have never seen any for sale :s

Cheers,
Matt

Its the thing above the rear window by the way!

I think that's what they're for, dogs.

They wouldn't stop any would be thief if there wasn't a dog inside  

Nah your right, but i think they looked quite retro   might just have to get some and paint em white or something

looks like he ram raided a garden centre

pearcestu said

looks like he ram raided a garden centre

       

haha not too keen on the belt buckle bonnet...