I wanted to update the parts #s for the connectors Hypex uses for the signal and power inputs.
Here are the connectors you need to re-wire the inputs using the existing connector scheme:
Signal input wire connectors by Molex: housing 43025-0400, pins 43030-0008. I bought them from Mouser. I used shielded twisted pair 22 ga. silver alloy from Signal Cable. The Cardas litz wire also looks like a good and cheaper alternative, but is not shielded.
AC power input wire connectors by JST:- housing VHR-3N, pins SVH-41T-P1.1. Bought from digi-key. I used 16 ga. PCOCC wire for the upgrade.
These are cheap, so buy twice as many as you need.
Tedious work this, particularly the signal input connectors, but very audible improvement from both upgrades. The signal input upgrade was a particularly notable improvement.