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Assuming I am working to the maximum size of it replacing the parcel shelf, then I have got a bit to cover it.
The material is a 10mm thick acrylic so it should be plenty srong enough for that type of size, it has a special optical coating that is flow-coated onto one surface that diffuses the light. To be technical, it has a gain of 0.8 and a half angle of around 55 degrees. So should be OK for your needs.