I think welding cable is pretty flexible stuff. At least the ones I have are.
I think tony might be able to work something out with you since your on a budget.
But honestly all you need is 6 ring terminals, a fuse holder and fuse. And some true 0 gauge ofc wire. Shouldn't matter too much what brand as long as it meets specs.
If you want to piece it together look at either darvex, or shoot skyhighcaraudio a pm about stuff.