Moist-O-Matic Mole Ditch Digger

We have an obviously ancient ditch digger manufactured by Moist-O-Matic (which was bought by Toro) in Riverside, CA with the name Mole Ditch Digger, Model #990-01. It has three (3) "tines" on a spindle-type of mechanism which dig the hole on one side and a small motor on the other.

Wondering if anyone has any idea where we might find the aforementioned "tines".
Thanks!

CW