Huh. I always thought you had to change the inner transom assembly too. Could be wrong though, I've been wrong before. You might try Dave at Motion Marine in Holland for the rest of the parts. He tends to have some stuff laying around too, or know where there might be some. 616-3956-5013
Or, Jim Valako at Valako Race heads. He has all kinds of "stuff" laying around upstairs at his shop. 616-735-0800
Hopefully you will be on the water soon!!