there are few cables terminated with 2pins housing. kz zsn and new kz zs10pro use that kind of termination, so you could search "zsn cable"; but the results are cheap cables (kz, jc ally, xltrade..). you can also search for QDC or anole at lunashops (4 cables available, atm), or at aliexpress.
you can use any other 2pins termination (0.75mm, or even 0.78mm probably), although the connection won't be as secure as with 2 pins housing, and the result will be longer.
edit: guess cables for some tfz also works, if the size of the cavity matches with qdc.
this cable, for example, isn't bad (i've just received it):
https://www.aliexpress.com/item/New...-78mm-MMCX-IE80-IM-Connector/32964307166.html
or
https://www.aliexpress.com/item/8-S...Earphone-Headset-2-5mm-3-5mm/32965501955.html
edit2: about polarity, the only way to ensure is using cables where QDC shows in their description. otherwise, look for straight plugs with no ear guides (well, ear guides can be removed or remolded)
perfect thank you