You're best off taking a space duel or other common vector harness, and cutting off the connectors and crimping on new pins in the quantum configuration...
I've done that for 2 quantums... nothing like a nice new connector -- not like the wires themselves are going to go bad.
I may still have some tempest -> quantum adapters left if you want to go that route (but I'd still recomment repinning the tempest PCB end of the harness, and once you've done that you might as well just move the wires around and make it quantum)