anyone able to point me to where I can get info on the dimensions of the siren mounted on a shermans fenders?
I don't have a drawing of the siren, but I do have a number of drawings with the siren on them. They appear to be 5 inches O.D. and about 7 inches from the face to the back of the housing. The type in the drawings has a bit more rounded face with the "V" shaped brace on the grill. So the length from front to rear may be a bit shorter on the style you have pictured.
Hope this helps.