The 16 and 24 bay models of the HP DL 380 G10 require a SAS expander. This is the expander I’ve frequently come across in the field. See the following tutorial for cabling instructions.
Manufacturer: HPE
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HP DL 325 G10 Riser P04969-001
This is the riser for the HP DL 325 G10. One slot is x8 the other is x16.
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HP DL 325 G10 8 Bay RAID Cable 874001-001
This is the RAID cable for the DL 325 G10 8 Bay chassis. It attaches to the backplane and then terminates at a RAID controller installed in the Mezzanine slot.
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HP DL 325 G10 Heatsink P06345-001
This is the heatsink for the single CPU DL 325 G10 server. This particular heatsink was pulled from the 8 bay model.

