Re: Please look at pix and tell me what this is.......
First of all, that SN is for a transom shield, not an outdrive, second, it's a 1992. Third. from 91 through 93, the Gen II drives did not have reservoirs, the hole was in the bell housing as shown, but nothing hooked to it.
There was no passage thru the transom shield for a fitting even.
The bellhousing may have been replaced for a number of reasons, and all the new ones have the hole.
Best thing to do is see if there is anything on the outdrive to match the hole.
If it has a dipstick on the top of the drive, there is not a fitting on the drive.