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There were units offered for 6 volt but I did not determine whether there were specific units offered for the older Packards....but the case on the unit I purchased looks quite similar to the generator on the Packard.
It sounds like you have bought a Powergen unit
https://www.qualitypowerauto.com/catalog.php?category=145 which is essentially the same electrically as a typical alternator but housed in a generator style case. Many have installed a modern looking alternator on the Packards but mostly in 12v neg ground conversions. There have been a few 6v positive ground versions of the modern looking unit as well as one or two installs of an alternator custom built into the original generator case.
http://www.gener-nator.com/index.htm To the best of my knowledge only the heavier wire from the alternator to the battery connection was required. Not sure what has typically been done with the old regulator but it is not used with an alternator. They could have been jumpered around or removed. If the car has an idiot light instead of an ammeter then sometimes a couple of other changes were needed.
With the selection of stock pulleys available I believe the Powergen will be able to fit most Packards except those with the 356 engine having the extra wide fan belt. As far as I know, there is only one alternator vendor that has been willing to custom make a pulley for the wide belt providing the alternator was bought from them. I don't believe they sell the Powergens though and last I heard the cost of the custom pulley was approximately the same price as the alternator.
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