Question about broken water pump stud on an 03 Toyota Sienna?

Hi,

I was changing my timing belt and I ran into a snag. I changed the water pump and when putting it back on I was tightening one of the NUTS. (There were a couple of bolts and 2 nuts that went on studs)

When I tightened one of the small nuts on a stud sticking out, I guess I did it too hard and it broke off flush on the outside of the water pump.

Can I fix this stud some how? Is it a common part? Does it simply unscrew where I can put in a new "stud rod" or am I in a bad jam? Do I have to have both nuts (that are close together) or could I get by with just 1 of them?

Thanks. I'm really scratching my head on this one.
 
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