On 16 July 2003 Eric in San Jose wrote:
"I know that the screen in the middle of the MGA dash was for a radio speaker but have never seen anywhere what was behind the screen. What kind of speaker was there, how was it mounted, and what did it look like?"

There is (was originally) a rectangular pressed cardboard cone. This cone was attached at the same points where the screen is attached to the dash, and then also screwed down on the two lower dash supports. The speaker is mounted at the back of this cone. You may be able to find a suitable size speaker at Radio Shack. You should also know that this did not work very well.

Todd Clarke at Clarke Spares supplies a kit with everything you need. It's a fiddle to fit (like the original) and it's hard to maneuver around the wiring, as this type of speaker mount takes up a lot of space behind the dash.