Thanks for the info. Original 1975 dual M/C had 9/16-20 threads for front fitting. Of coarse I had pre-made lines with 9/16-20 ready to go. Had an extra 9/16-20 fitting also. Replacement M/C had 9/16-18. NAPA fixed me up with 9/16-18 adapter to use with 3/16 fitting. Switched pre-bent line to 3/16 fitting. So that was okay, but the actual correct fitting looks better. Don't know when they switched thread sizes.
Took this photo info to Auto Zone. Of coarse the blister pack spot was empty. <$5 for 4. Should have first thing today.