Locating Server-Grade PSU-to-PCIe Power Cables for Bitmain Antminers?
A solution, but still not optimal for me, is on a Bitcoin Forum posting. 

The server grade HP DPS-800GBA connectors are completely incompatible with FCI PWRLOPRO connector that my existing server-grade PFE1100-12-054RA PSUs connect to.

Wound up canabalizing the Coolmax ATX cables.  Only needed to solder the ends of the cables to prep them for crimping into a 4 AWG lug.  Tested the fashioned cables to make sure the voltage being delivered was indeed 12 volts DC. For now, the PCIe voltage sensing pins are floating, no PSU feedback being supplied. The server PSU is much noisier, but takes up significantly less space, and is about 15% more power efficient than the older ATX PSUs. Will see if everything still works in another month. See the picture below.