TOPIC: 50 hp Force impeller

Good Morning all
I did'nt know where to post this but maybe here in Mercs someone can help me. I am replacing the impeller in a 50 hp Force outboard
and could not find this part in Sierra or Mallory. It seems from about 1984 to about 1991 these parts are skipped in the catalogs.
The model number on my motor is 50YX7b,it has the lower unit where the exhaust comes out the back of the cavitation plate,not through the prop.Thanks for your help, Jack in AJ

Must have posted this in the wrong place,anyways,I found this impeller in Quicksilver parts and it is the exact part as my origional.It is part #47-F-433065-2,made in USA 03/01/10.