@neardeaf You will need 2x MiniSAS HD (backplane side) → MiniSAS (HBA side) cable per HBA card. To be specific on the connector names it is SFF 8643 → SFF 8087.
You will be able to select these cables directly from our store when you place your full order.
You will need 4 of these cables to access all 15 drives. As the backplane has 4x MiniSASHD connectors . These cables are included in the price of the chassis.
Here is a picture of the cable for reference.
