1975 Evinrude 40 hp 40555C Impeller

[Champion1956]

I ordered a new 386165 water pump impeller for my 1975 Evinrude 40 hp 40555C. The BRP Online Parts Catalog shows impeller number 386165, and that's what was stated on the new impeller package, the new impeller is 1/4" thinner than the old one. The new one being 1/2" thick, and the old one is about 11/16" thick.
Please Help! What impeller do I need?
Thanks, Tom

[boats.net]

That impeller should be correct, it is possible someone may have changed it previously with the incorrect impeller.