First: I'm not sure about a 140. I've got a 1965 122 which *looked* like stock parts (I've changed a lot of brake parts lately...but that's a whole different story of bizarre modification and weird bracketry).

On the 122, all of the fittings I removed were standard 3/16 line with 3/8-24 line nuts (that is, the "normal" line nuts you get when you buy American brake lines with nuts on them for any random American vehicle).

I own several vehicles, and this is what I do:

I buy that same, standard 3/16" line with the 3/8-24 line nuts. A roll of line and a box of fittings and a flaring tool will last all my cars, about forever.

When possible, I then buy my rubber brake lines to directly accept the 3/8-24 fittings. On the 122 and most American vehicles, this is easy. Some other vehicles are a bit trickier but since Girling, Lockheed, and ATE make a lot of the brake stuff for US and Euro vehicles, it's mainly the Asian stuff that's tricky.

When I can't get the parts to make this all fit together easily (usually only at the Master Cylinder end, and then usually because it's Japanese bubble flare or something), I go to NAPA or a similar parts place and buy, for about $2.50 each, the fitting adapters that screw into the master cylinder/caliper/wheel cylinder/other and adapt it to the 3/16" line with 3/8"-24 fittings.

And then I never have to worry about it again. Even if I blow a brake line in Houlton, Dixmont (or was it Dixfield?) or Castine, the local shop will have the parts I need and not have to worry about a strange adapter or fitting or having to cut/flare a special line for my weird brake setups.

Ben