You should have received an original B9A from the court after you filed. It will have your complete social security number on it (If you try to get a copy from the court, it will only have the last 4 digits). Copy the one you received, front and back and send it to the added creditor, or if you do get a copy from the court, provide the complete SS# when you send it out. In either case, you then file a certificate of service with the court indicating that the notice included the entire social security number.
You must make copies of all pages of the B9A and mail it to each of the new creditors. You CAN'T draft a new one.
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I am not sure how you think you would fill out a B9A as it is a document prepared by the Clerk of the Court, not you. Send the original B9A and file a certificate of service which you must prepare. Hope this perspective helps!