The server name is no longer a requirement to install the SELECTserver application. The important items would be the SERIAL NUMBER, SERVER ACTIVATIO KEY and the SITE ACTIVATION KEY. You can use the same information provided for the previous SELECTServer installed on the now defunct server.
Please review the link below.
How to Install the SELECTserver application
http://communities.bentley.com/products/licensing/w/licensing__wiki/how-to-install-the-selectserver-application.aspx