R240 2 Bay Cabled LFF server needing 2.5" Drive Tray adapter?

Hello,

I have an R240 2 Bay LFF Server and I want to add 2 x 2.5" SATA Drives, but the 3.5" trays are too big.  Do I need to add a type of 3.5" to 2.5" Tray adapters?  Can you please let me know how to make this work? I know that they're compatible.. just need them to fit.  Can you please help (and provide a part number)?

Thank you! : )