You can make your own double flares or you just buy the preflared tubes in various lengths between 8" and 72". You can get them in either plain brake tubing or armor clad tubing as well. The only catch is that they only come in standard tube nut configurations, i.e. 3/16" tube comes with 3/8-24 tube nuts, 1/4" tube comes with 7/16-24 tube nuts, etc.
For some reason Ford used 7/16-24 tube nuts on the 3/16" tube at the caliper end of the front axle hardlines on my '77 Bronco...I would suggest changing over to 3/8-24 if you're putting in new flex hoses at the same time.