Changing the SSN for HH bond interest

I'm working with a client whose husband has died. They were co-owners of a number of HH bonds. She isn't ready to update the registrations on the bonds yet, but needs to change the Social Security Number that the interest is reported under from his number to hers. What form do we use for this?

Tom's response

If all you want to do is change the SSN that the HH bond interest payments are reported under, use a W-9. Complete and sign the form and send it with a letter describing the bonds and giving the old SSN to: