Hey man. I've got '79 bronco axles on my Frontier. A 14" is slightly too long a shock to run easily; you'll have to cut into the engine bay to make the hoops long enough. A 12" is long, but workable, and a 10" is just too short for how much travel you'll be getting with those long-arms...

I have close to 15" of downtravel up front, but (obviously) no way to use it all right now.