I have a 1997 Triton. It has the plug with fine threads and those can be hard to find. Rockwall Marine didn't have one when I tried to get a spare. I suppose I need to do some more looking around because not having a spare isn't a good idea.
I would make sure and take the plug you've got in with you to Academy or wherever to make sure the threads are the same.
Life can only be understood backwards; but it must be lived forwards.
- Soren Kierkegaard