Packard didn't publish a shop manual for 1934, the owner's manual mentions bulbs by candlepower but not manufacturer's bulb number. The headlamps are Mazda 3003, the others can be easily identified by pulling them and looking for the number stamped on the shell. All except the headlamp bulbs are readily available from NAPA or good autoparts stores. The 3003 bulbs are uncommon and expensive.
This chart for 1933 Packard mentions the bulbs at the bottom right, same for 1934. The same publication also has a bulb chart with full bulb particulars, I have it scanned and saved somewhere, if I find it I'll add it later.
Note the curious error, data for the 8-cylinder but wiring of the Twelve.
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