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What does the "B" in the "B" 63 for the Tail lamp Mazda No.? I have found the Mazda 63, but no returns for the "B" 63 when I search. Are they the same?

I do not know the answer to your query, but thought I would share my 2 cents worth.
I did not use the standard bulbs in mine, I used one from Restoration Supply, their part # is ELE121 and it is a 1680 bulb. It is a direct swap and is very bright. For the stop light I used their ELE064 Halogen bulb and it again is a direct swap and is brighter obviously than the tail lamp. I prefer to be seen well as it is mostly daytime driving and the halogen bulb is quite visible even on sunny days. I also run turn signals through the rear brake lamps and again these work great.
Bob J.

By all accounts, they are the same. I believe the original "B" was for bayonet base, but I cant substantiate that.

All plain designation 63 bulbs seem to fit identically with the correct incandescent amperage at 6V, so you should have no problem.

If you are going for a concourse restoration, then you will go down the incandescent avenue, however I have a faithful "driver" so am choosing to use (and seriously recommend that you consider) LED 6V plug/play replacements...check this link out and consider that (you can pick the temperature/luminescence color so you can get the right "look"):

https://www.ledlight.com/63-led-bulb-7-volt-ba15s-base.aspx

If you go LED on many bulbs, contact me and I can give you the links to headlamp, interior, tail lamp, etc as I went through all that research/crossover stuff and could save you some headache.

I hope this helps. Dan M. (37 Senior Sedan)

Thanks Bob and Dan. Very helpful and good guidance.

Dan
I will send you a PM. Would Lille to get that info you offered and save me a headache. I am running low on Tylenol!!

Ben