finally, we've found some they actually have in stock that will work for it
turns out using welding cable to wind it is probably a bad idea though so now we need to find out where to buy litz wire or something
or just make our own by braiding magnet wire or something? _that_ sure sounds like a pain
on a slightly related note why does this wire distributor have a dedicated section for specifically and only AWG #6 wire, when everything else is sorted by type of wire, not by size https://www.wireandcableyourway.com/6-gauge-wire/