vCloud Suite 5.8 had just been released with new product releases like vCenter 5.5 Update2, ESXi 5.5 Update2, SRM 5.8, vSphere Replication 5.8 to name a few. For a complete list, you can refer to this link.
Itching to try out the new vSphere Replication 5.8 in conjunction with SRM 5.5, I went to the download site to get it. But looking at the dowload page for VR 5.8, it looks like vSphere Replication is not supported in SRM 5.5.
And verifying the VMware Product Interoperability Matrix, it is confirmed that only SRM 5.8 is supported.
But for standalone vSphere Replication without SRM, VR 5.8 is supported down to ESXi 5.0