Hi could you please get in touch with your local sales team or there should be a team that are dedicated to a sales that are dedicated to those who wish to purchase part components.I think what you are looking for is  470-AFFQ (CUS,CBL,SAS,PERC11,X8BP,R540) for reference. But we can not guarantee it will work because this changes the PERC. Wish you a good luck.
I have a client that recently purchased 10 x R550 8LFF servers configured with H355 front PERC controllers.  As it turns out they want to run their storage on RAID 50, which is not supported by the H355.  I have some H750 LP controllers that would facilitate RAID 50 for them but would require the following PERC SAS Cable to run from a PCIe slot....  Dell PowerEdge R540 R550 8 LFF PERC11 SAS Cable H750 I located the following number on the Dell P/N sticker on the cable...0734K6  I do not believe there is a Customer Kit SKU attached to this assembly, so I don't think I could acquire these directly thru Dell.   Can anyone possibly recommend a source where I could pick up these PERC cables (possibly 10+)? Thank you  
Dell PERC11 R550 8LFF SAS Cable H750