as I said,
it's PEX, high density polyethylene, a different
type of "primary wire" .... and it's not generally found in any parts or electrical/electronics store because it's overkill, not because suppliers 'think you don't know better' .... current OEM involves computers and all the latest and greatest including using the XL plastic for the ducting but that doesn't make it "higher quality", spend the money if you wish, but no truck we deal with here came with it and as I said for your query, it is not "necessary" providing your routing the wiring properly, as original
Bill