Here is an inexpensive solution:
I found that your local auto parts store carries all the pieces you need to do it for around $1.00 each.
Ask for a Steel brake line tube nut. (part number - Weatherhead 105x3),
one 3/16 compression ring and one brass compression nut.
The thread on all of these is 3/8-24. Just what we use on the Digatron fittings.
There you go. $20.00 saved and no wait for shipping.
If you were just replacing the weld on part then you only need to get the tube nut.
I use these on my engines.
Hope this helps.