You didn't mention a year but I suspect all the 6v cars would be very similar. The 37, 41, 42 and a couple of other wiring diagrams say 14ga was used for the headlights. The most thorough and best reading quality diagram to download and get a general idea of what size was used on anything would be the 42 20th series although the colors may have differed by year so wouldn't use it for that.
https://www.packardinfo.com/xoops/html/downloads/wirediagrams/1942%2020th%20Series%20All.pdf Most of the loom places sell the proper color wiring by the foot. You would need to identify the color and pattern of what you need unless you have a wiring chart that calls it out. Rhode Island wiring
http://www.riwire.com/ has a good color page showing cables and pattern identification, YnZ
http://www.ynzyesterdaysparts.com/ has a good wire and connector catalog to download.
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