Tom,
Are there any weld scars on your differential housing to indicate where the original brackets were fitted?
The attached image was shared by Alex in post #6 of this thread:
http://www.mapleleafup.net/forums/sh...d.php?p=265924
This is the best image I have found which shows the early headlight bracket on a one-piece differential (it certainly helps that the headlights are missing).
My best guess is that the bracket as shown in Rob’s images from the Early Sexton parts list is welded directly to the differential housing.