Why do you need the form SS4 if you already have the EIN?
I would suggest you contact IRS and ask them to issue you a EIN letter. You may not be able to get the SS4 form from the IRS as it is too old and they may not even have a copy.
Let me know if you have any question.
Please note: This advice is provided with the understanding that all the relevant facts have been provided by you. Any change in facts might affect the advice given and hence may not be relied on in such cases. Nothing contained in this reply was intended or written to be used, can be used by any taxpayer, or may be relied upon or used by any taxpayer for the purposes of avoiding penalties that may be imposed on the taxpayer under the Internal Revenue Code of 1986, as amended.