HTTP headers used for SSO integration with OAM11gR2

I've found plenty of documentation on how Forms works with osso for SSO including what http headers gets from osso, ie

HTTP_OSSO_USER_DN
HTTP_OSSO_SUBSCRIBER_DN

Since I am using OAM11gR2PS3 for the SSO integration with Forms using a webgate, I am interested to know what the equivalent headers are that are being used.

I have users that are authenticated by OAM successfully using OID as a datastore and DIP to sync AD users into OID.

However, Forms fails to redirect the user to the dynamic RAD page. I am suspecting that the DN being send to Forms or the subsequent lookup by Forms against OID might be a mismatch and thus calling the RAD page fails.