Centurion 5/1 in Vietnam turret detail info needed

[pwypior]

Hey, guys,

I have another tough question for you. I am finishing the turret details of my Aussie Centurion Vietnam version – the AFV Club kit. It is known from many photos of Aussie Centurions in Vietnam that the crews used a kind of sunshade cover over the turret, made from rectangular tarpaulin piece. This sunshade cover was mounted on four poles installed in a sort of tubular sockets welded directly to the turret’s lifting eyes of the tank. And there’s my problem: does anyone know what was the height of the four poles supporting that sunshade cover? I want to scratchbuild these poles to depict my Centurion with the cover fully erected, but I don’t know how high were these.
Was this cover a serial modification made to this tank in Vietnam? Does anybody also know the height of the tubular sockets in which the supporting poles were installed?

Here's the photo presenting the cover fully erected over the turret:

http://members.tripod.com/hydetft/gp63.jpg

Can anyone help? Any Aussie Centurion ex-tankers here?

Thanks,

Piotr