Your Sea-Bee was made by the Gale division of OMC (Evinrude/Johnson). There’s an “All products” manual at http://richardlpaquette.ca/vikingmanuals.htm that will tell you what Gale model number corresponds to yours, and manuals for two versions of “Viking” (a Canadian store brand) 12hp.
Or you can post your model number, and someone will come up with the right parts diagram for your engine.
http://www.omc-boats.org
http://www.aerocraft-boats.org