Is the 1985 Honda CR 500 water pump gear shaft compatible with the 86-2001 Honda CR 500 water pump gear shaft?

I have a 1985 CR 500 and the water pump gear shaft broke. It has been discontinued from Honda, and no one else has it. It is a metal gear. The one's for the 1986-2001 CR 500 are plastic. If I have to use plastic, I will. However, I prefer not to. If anyone knows where I can get the OEM 1985 Honda CR 500 gear shaft, I would forever be grateful.

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