If you can't find one see if one of the members won't measure it for you. It's nothing but a chunk of steel. I would do it but I don't have a micrometer. You do still have the ball bearing that is behind it don't you?
The one I was thinking of is more or less an extension rod. It is about an inch long and comes right out of the clutch assembly. there is no retainer of any kind on it. Between that rod which allows the clutch lever to push the clutch mechanism and engage there is a free ball bearing. I am always warned to be careful not to lose it. So maybe you add send a picture of the part you need.