Master Cylinder Fittings

Does anyone know if autozone, o'reilly's, or Napa may carry the two brake line tube nut fittings for a later model master cylinder? Turns out, they're two different sizes (1/2-20, and 9/16-20 for 3/16 tube) I bought one 1/2-20 tube nut yesterday at napa, but it's a little too short.

They sell them at Inline Tube, but I'd like to find a part number to buy locally if possible. We all know it's impossible to find anything like this at a parts house without a part number.

Thanks!

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