Looking at your pictures (which somehow only posted this morning, but with a timestamp pre-dating my response), you don't need to worry about cabling. The SAS backplane will take SAS or SATA drives, of either the 2.5" or 3.5" variety.
HelloI recently purchased a Dell r320 from the Outlet. Unfortunately I've realised that I probably shouldn't have gone for the Perc H310, so am looking to upgrade. I'd also like it to run with supported SSDs, even though it has the 3.5" drive caddy format. Can someone help me work out which parts I need to purchase to get this spec. I don't mind switching from SATA to SAS (presumably this is just a change of cable?). Thanks for your asssistance.  
R320 / Perc H310 / SATA 3.5 - want to use SSDs