yeah your right guys, I am using the HB c-hubs. I ordered the BD5 c-hubs because...
i really really liked the idea of NOT
having the drill out the outer arm hole for the hingepin. I was very excited to try it, direct bolt on sounds nice...NOPE!
The old BD knuckle would not fit in the new BD5 C-hub! The knuckle was too fat! I would have had to sand off or mill the old BD knuckle to get it right, so i said screw it and since i get a deal on HB parts, I used the HB C-hub and drilled the arm. Easier. Still used the old knuckle and my old driveshafts.
However I noticed the HB C-hub flexes like a son of a b----
I might chalkup and buy all the BD5 parts sooner than i expected.
If you can afford it, go with all BD5 parts, knuckles, c-hubs, driveshafts, kingpins.