Re: 1975 2hp water pump
Lots in stock (I just checked). They made that gearcase for many years, so it is still available and will be for awhile.
OMC IMPELLER 0382221 about $10 or Mallory marine IMPELLER 9-45221. Both work fine.
Iboats says it has 1 left of the mallory. When you get to the Evinrude impeller listing you have to scroll down the page - it's not shown at the top like most of them. CTRL F is your friend here.
marineengine will have it also, but shoot for the company that pays for this forum!