Hi I know this boat and almost bought it off George myself purely for the out drive.
Your out drive is a sternpowr. This is spelt correctly with no E in power. I thought it was the same as mine that I struggle to get parts for the rare mainly military 1000 series.
But it was the 100 series and there are many parts around still.
Mike at Lancing Marine will sort you out but be warned my prop on the 24ft Wilson cost me £875+vat
There is also a guy in Yeovil who has a vast stock, Google DD paciffics.
I hope that is of help to you.
Malcolm