So I'm trying to buy the Pos/Neg battery cable upgradeThe WayBackMachine has a pretty complete copy of Gary's site. How to get the files, that is another question.
Gary Clarks Innovative Wiring - Archive Site
I purchased a good bit of wiring/cables/battery connectors from Gary over the years. He is a good hardworking gent, quality always top grade. ToonWarrior, maybe you can put something together on one of the suggested domains, like garysinnovativewiring. That seems like a good choice.