Help finding parts for kohler k141

[brodi3man 0]

My 633 horse needs a new "fly wheel" cup.

You can see the part here http://www.partstree.com/parts/?lc=kohler_...41&dn=022700859 Labeled 'B'

My horse still has that part just all the teeth are worn smooth. Im a newb to finding replacement parts.....if any are available.

thx