The MGA With An Attitude
SQUARE UMBRELLA For MGA - AT-097
This doesn't attach to the car, but it can be used with the car, so I suppose we can still call it and accessory. It is an 8-strut square umbrella that is large enough to cover the entire cockpit in the MGA. Good if you get caught in a gentle rain while standing still. Not recommended for travel speed over 5-mph.
Available from The MG Car Club Ltd, UK