There is no SecurID authenticator in Sidewinder 7.x, which means that Sidewinder can not use the SecureID protocol. What you can use instead is the RADIUS authenticator because most SecurID servers can be setup to accept RADIUS authentication.
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RSA's ACE server provides a radius proxy locally so that you can integrate radius clients directly (no extra radius server or software required). As Matt mentions below, you will need to configure Sidewinder to use radius as the transport and point to the ACE's radius instance. The resulting configuration is SecurID authentication from Sidewinder.
Thank you for clear explanation!