With great and total respect for our host, iboats, I say that is incorrect. Yes it is true that 18-3083 fits a 1959 Johnson or Evinrude 35hp. But you don't have a Johnson or Evinrude, you have a Gale. Your water pump is the same as a 1957 Johnson or Evinrude 35hp and takes a 18-3006.
To explain, the 1959 Johnson and Evinrude 35hp motors had a thermostat-controlled recirculating cooling system with a taller impeller. Your Gale did not have a thermostat or tall impeller.
But I'm not selling you an impeller, iboats is. I'm just trying to keep you from ordering the wrong one and have to return it.