Well I found a 13" brake kit for our trucks but its something I could make myself and I might wind up doing in the end... The kit is 800 bucks and uses a normal drop spindle with the ears cut off and 2 holes tapped so an adapter bracket can be bolted to it. It uses either NBS or NNBS calipers and c5 rotors with the 5x5 dilled on it. And as far as the hub it resembles a turned down rotor. This thread is pretty much what the company is selling..
I was hoping for a better product but ...
check out this link, its a nice walkthough:
http://www.geocities.com/diels12000/BrakesII.html
Ive been making a few trips back and fourth to autozone and this trip gave me the nnbs spindle blues... haha. The 87s upper and outer tie rod was too large for the tapered bores. Im not sure if they are a different taper or not becuase the threads would not even fit through
The only possibility to make these spindles work would be to ream the top ball joint to size, sleve the bottom ball joint bore and flip the ball joint upside down. Depending where the outer tie rod sits in relation to the knuckles mounting point there are 2 options here. ream it to fit if the orientation is going to mount like factory NNBS - stud pointing down, or drill the taper out and insert a sleeve and make it like OOBS - stud pointing up.
Hopefully the next time under this thread I will have something cool to show for..