When you change the lower unit oil, make sure you fill it back up from the bottom, the motor should be in the upright position and fill it until the air bubbles stop coming out of the top plug, this prevents an air lock and will able you to put in the proper amount of gear lube in.
You should pick up the adapter that goes on the bottle of gear lube and then attaches to the lower unit to fill it, you don't need it to do the job but makes it easier and less mess, CTC, Princess Auto have them.
Did you ever get the Model #
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