How to add a Cipher Suite using RSA 1024 algorithm to the 'SSL Cipher Suite Order' GPO

Following a VA test the Default Domain GPO has been set to enable the SSL Cipher Suite Order.  Following the change Symantec Endpoint Protection Manager doesn't work properly as the the Home, Monitors and Reports pages are blank and an Schannel error is logged in the SEPM server's event log.

I have spoken to Symantec and I have been told that we need to allow the RSA 1024 bit algorithm but they can't tell me which cipher suite this would be.  I have looked in the GPO setting and can't see an RSA 1024 suite but have found some in this article: http://tools.ietf.org/html/draft-ietf-tls-56-bit-ciphersuites-01

I want to know how to add an additional cipher suite into the setting safely.  Am I able to just add the suite into the GPO setting (eg TLS_RSA_EXPORT1024_WITH_DES_CBC_SHA) or do I need to do anything else beforehand?

If anyone has any advice regarding this or cipher suite orders and troubleshooting SSL problems it would be much appreciated,

Thanks

Chris