Is this a full gear shift or direct drive or Neutral/Drive? Model number may be on the mounting bracket.
Many parts from all the private labels supplied by Gale may fit.
Goodrich "Sea Flyer",Gamble Skogmo "Hiawatha",Fedway "Saber",AMC "Saber",Atlas" Royal",Gale Products, Spiegel "Brooklure",Goodyear "Sea Bee"
And the various Sea King models.
An Expert may be along with more specific info.