The bulbs shouldn't be hard to find. They are fairly common. For example, the table below is for a 1951 Hudson (from the Owner's Manual). A quick search shows 55 bulbs are easily available at Advance Auto: https://shop.advanceautoparts.com/p/sylvania-55-longlife-mini-bulb-pack-of-2-55llbp2/10030933-P It is usually the part stores databases that don't recognize that they carry the part you need.
Go to a good parts store like NAPA to find the odd ball stuff, the mass chains employ kids that don’t know crap about anything new much less an old car.
51 Hornet Club Coupe 51 Hornet Sedan 51 Commodore Six Club Coupe 50 Pacemaker Deluxe R.I.P. (burned and destroyed in building fire) 49 Super Six Sedan
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51 Hornet Sedan
51 Commodore Six Club Coupe
50 Pacemaker Deluxe R.I.P. (burned and destroyed in building fire)
49 Super Six Sedan