Latitude 5531 Battery Cable P/N

Can anyone provide the DP/N for the battery cable for the 6-cell battery (included with the nvidia GPU model)? Annoyingly ordered a non-nvidia model specifically, couldn't choose the larger battery, forced to buy a separate 6-cell battery, only to find Dell used a slightly different connector on the battery from the 4-cell model and doesn't include the cable with the replacement. And of course Dell doesn't provide part lists like HP business laptops.