DKIM signing having same public key

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http://serverfault.com – I have 20 servers hosted on orderbox DNS hosting,I have set up opendkim on all servers with signing by domain say "example.com" i.e d=example.com in DKIM header of all the server outbound mails. The public key generated by all the servers is different, but i want the public key to be same in all the servers so that i get dkim="pass" by entering the universal public key in the DNS hosting TXT record entry. My server's are using centos5 ad postfix as MTA. (HowTos)