BartWarsaw,   The optical drives power cable, for both servers, would be part # 4C4Y9.   Let me know if this helps.  
Hello.   I'm struggling with DVD power cable for R450/R650xs. I cannot find this anywhere. Can you help me with this. I have compatible DVD drive, but without this cable it's useless.   Thanks in advance.
R450/R650XS Optical Drive Power Cable - what P/N?