Rear side window cover rack thing on a holdsworth

[Daveandluca]

Hi all!
I have a Holdsworth minus the interior.. I notice that originally most of them seem to have a rack type shelvy thingamajiggy covering the rear drivers side window, the one half covered by the wardrobe unit.
I don’t suppose anyone has seen somewhere still selling/making these? I can’t seem to find any being listed ton fleabay etc..

Dave