Napa generally has been able to supply almost all 6v bulbs. Their website lists both of those in stock at my local store so maybe call or visit yours to check availability. If they are not in stock locally they can be ordered from a Napa warehouse and usually arrive in a day or so -- although in some cases there is a freight charge for special orders if it is a small order.
Another source for 6v bulbs I have used before is Y and Z Yesterday's Parts
https://www.store.ynzyesterdaysparts.com/6v-bulbs.html but when I last ordered from them there was a minimum charge. If you are ordering several bulbs or stock up on something other than bulbs that charge may not be an issue. If you are only needing one or two bulbs then you need to factor the minimum and freight charges in and may be able to find less expensive alternatives.
There have been several Ebay vendors who offer various bulb kits consisting of several of the more commonly used bulbs. Most of those kits seem to cover all that Packard used but there is the occasional extra or missing bulb.
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