Option 1 - take the sheered parts to a metal worker see if he can make a new one or weld the broken one.

Option 2 - take the sheered parts to an official Yamaha dealer and ask them to find out the part number and order one.

Option 3 - call all your local bike breakers see if they have a moody engine you can buy for spares.

Option 4 - keep effing and blinding to yourself in the mirror it's good for the soul