Need a photo, Jack. If the color is green, and original, that would be a good clue.
I was at the Peachtree Register's MG GOF (Gathering of the Faithful) in Hiawassee, GA yesterday. There were about 80 MGs, from a beautiful PA to every flavor of "B" and all in between. There was a very nice Morris Minor woody van...little bitty _green_ motor with a single carb.
Could be from a number of different vehicles.
Ray