I don't think you'll find Firestone branded bias tires, per se. Bridgestone bought them but there's people making them under license. such as:
universaltire.com/firestone-tires/firestone-vintage-bias-ply-tires.html Lots of other fish out there, Coker, Diamondback, etc. I don't recommend vendors.
If you're not familiar with rayon cord bias tires, I suggest you may not like the ride nor the longevity - just to be "correct". Bias look radials are available.
I don't think tubes are period, they should be tubeless, post war. My '49 is. cf: A 235 75 barely fits. 8.2" equals 208 mm, in metric sizes. 205 or 215 closest.
Tires don't last so avoid anything over 8 years old, if you find OEM. Ask Leno...
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