For anyone who is looking for their SERIAL NUMBER LOCATIONS for a 5411 here are the positions I have found. I would think this would apply to other Universals as well. Hope this helps
Stamped on upper left hand corner of block - ignition side - facing flywheel end (front of engine).
Stamped in block directly above flywheel housing, under front oil filler.
On engine nameplate located on reverse gear housing cover.
On engine nameplate located on engine manifold.