And finding the right crimping tool was the other wild goose chase! There aren't many that crimp up to 4/0 (0000) AWG.
The supplier I finally found on Amazon that had the correct wire was WindyNation
https://www.amazon.com/Battery-Weld...hild=1&keywords=4/0+awg&qid=1589417294&sr=8-6
And you are best off getting a crimping tool and making the wires to the length you need.
https://www.amazon.com/gp/product/B07744NQ3B/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1
The supplier I finally found on Amazon that had the correct wire was WindyNation
https://www.amazon.com/Battery-Weld...hild=1&keywords=4/0+awg&qid=1589417294&sr=8-6
And you are best off getting a crimping tool and making the wires to the length you need.
https://www.amazon.com/gp/product/B07744NQ3B/ref=ppx_yo_dt_b_asin_title_o08_s00?ie=UTF8&psc=1