The Chevrolet Mater Parts Catalog 1929-1950, page 183 shows the 1941-1947 All commercial 3 -speed transmissions should be #591194 or #591195. Note: prior year versions of the MPC only list #591194. The later version shows both numbers.
I checked the spare transmission I have. It shows the #591195 cast number. A couple of photos of this one are attached. Note, it does not have the “bracket” shown in your photo.
