I'm having an issue here that's a real head scratch'er, and I'm hoping someone may have already encountered this and has a solution.

The Adaptec 2405 comes with a fan out cable with 4 straight SATA connectors.

The backplane on the SC-813 is about 3/4" from the fan assembly.

The SATA ports are about 1/4" tall, and the bulk of the SATA plug is at least 1/2".

Making a connection to two of the ports is difficult but possible (with the cable coming out of the plug at a 90), but the two directly in line with the fan assembly are a no-go.