There are two kinds of transom plugs that I know of. One screws into a threaded fitting and looks like this: West Marine: Transom Drain with Plug Product Display
And the other has a quick release handle or tee handle and looks like this:
Drain and Bailer Plugs at OutdoorSuperstore.com
I don't know which kind you have but I think that West Marine carries both.
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Curmudgeon at Large- and rhinestone in the rough, sailing my Farr 11.6 on the Chesapeake Bay and part-time purveyor of marine supplies