3116 turbo parts

I’m in the middle of going through a 3116 cat that I posted earlier in a thread of a boat I picked up in a auction. Seems the turbo sat for quite some time with water in it. Interesting enough it is cleaning up surprisingly well. I need some internal turbo parts. a seal ring and a oring and external gaskets. Having a hard time locating any parts breakdown of the turbo let alone any parts. Any Ideas where I can find some parts breakdowns of a cat turbo? Parts also?