25-10-2020, 02:10 PM
I did something similar to Malcolm with my Ruby: Cut cardboard to fit inside the back, side and floor of the aperture - adjusting it until it was flat and holding itself in place - then covered the cardboard with headlining material. It has been there for years. There are rivets still place in the original sloping metal base behind the dash that suggest something more substantial was fitted originally, but it is long gone.
Colin
Colin