Bulkhead help

[Mr_Banana_Pants]

I bought a tank that was pre-drilled with 3 holes. 1 fits a 1 inch bulkhead perfectly fine. The other two are 3/4 inch diameter holes and I cannot find any bulkheads to fit them. Has anyone run into this and can help shed some light?

 

[Mr_Banana_Pants]

This is the tank and pre-drilled holes.