Rather than listing the bulkhead size you should list the hole size. Different manufacturers produce different outer diameters for the bulkheads. AGA bulkheads are much smaller that sch80 bulkheads even though they are for the same sized pipe.
Yes, I haven't drilled the hole yet. So I figured I should get the bulkhead first and get the drill after. I just checked the Marinedepot and they have it listed as $5 each. It's not that expensive so I think I will just get the brand new bulkhead. Thanks.