Can I use this prop

[Badger2008]

I have a 1985 SeaKing 15 HP built by Chrysler. When I got it there was a broken 8 X 8 1/4 10 spline plastic pin prop. I can't find a metal prop anywhere and I dont want a plastic prop it will just break in the indian river here on the oyster bottoms. I found this prop on ebay and was wondering if I could get away with using it?
http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=230349234100&viewitem=&sspagename=STRK%3AMEWAX%3AIT
It is a 8 1/2 X 8 1/2

Thanks