Just finishing up this same project and saw this old thread.

I installed the black nightster / xr1200 bars on my 07 FXDB. Used 3-1/2" risers from Drag specialties.

Regarding the cables:

Stock cable lengths on FXDB Street Bob are: throttle = 32-1/2" idle = 31-3/4" clutch = 68-11/16". These are WAY too long for this setup.

New cables I selected and just installed with sportster bars: throttle = 30-3/4" idle = 30-3/4" clutch=66-11/16". Now that I have them on the bike, these cables still seem a bit long, and I'm considering to take them off and go with shorter lengths.

Looks to me like these would fit just right: throttle = 28-1/2" idle = 28-1/2" clutch=64-11/16".

For the front brake line, I plan to just buy a 7/16" and 3/8" X AN-3 35-degree banjo fittings, then measure for the needed hose length and buy it from drag specialties.

Bike is not together yet, still doing some additional wiring (adding two powerlets) before I button everything up. But so far I am loving the setup, these bars fit the Dyna perfectly.

Will post pics and parts list as soon as I can.