Dear Kandia,
Yes, the RADIUS server could be integrated for these versions. See some details here:
RADIUS User Authentication - What Is Secure Login? - SAP Library
Please, have in mind that we recommend to SAP customers to use always the latest support package of the SAP Single Sign-On product and at the moment it is SAP Single Sign-On 2.0 SP05.
Best regards,
Donka Dimitrova