Dell Poweredge R720xd and PERC H730P RAID Controller - What cable to use?

Hi,

I have a Dell R720xd that didn't come with a RAID controller.  It came with an LSI SAS 9207-8i host bus adapter.  I have since acquired a PERC H730P RAID Controller, which needs to be installed.  The RAID Controller didn't come with any SAS cables.  I understand that I need a Y type SAS cable to connect the backplane to the SAS connector on the system board as shown in figure 13 at the following link:

http://www.dell.com/support/manuals/ar/en/ardhs1/Topic/poweredge-r720/720720XDOMPublication_A06-v3/en-us/GUID-460EA053-A7D7-4D92-AED5-FAED86F44D0E

My R720xd has a 2.5" backplane.  i.e. the front looks like this:

What is the correct part number for the SAS cable that I  need to buy to connect the backplane to the SAS connector on the system board? 

Currently, there are 2 separate SAS cables that connect the backplane to the LSI HBA 9207-8I SAS Controller.  They will not physically fit into the SAS connector on the motherboard.  I believe I need the Y type cable as shown in the first diagram above.