For anyone still looking for Morgan luggage and suitcases I can manufacture it all - to your colour spec as well. I have fitted luggage for behind the seats on trad Morgans and for the Aeros boots as well. I have also made sutcases for the luggage racks (I wanted one for my own Morgan) and these can be made in any size to suit, but they are usually 80cm long, by 45-50cm wide, but 18-20cm high - so this still allows good vision in the rear view mirror and for high-level brake lights.
see
www.classictravellingluggage.com for all the details.