[Oil Gypsy]

After quite a bit of research I think I have found the answer. It appears there were four versions of this transmission, on the first edition the return oil was fed to a lower connection at the bottom of the bell housing, on the second and third versions it was fed to the lower connection on the Fwd/Aft housing (as in the photo above) and on the fourth version the return is on the top of the bell housing (again as in the photo above). I think at some stage one of my transmissions was replaced by a previous owner.