Disc brake swap on '67 half ton

[Alan Potter]

I'm sure this has been asked before, but I'd like to change from drum to disc brakes on the front of my '67 1/2 ton. What other year spindles would work as a direct replacement. I'd rather buy used instead of spending the big bucks for a kit. I'd also like to stay with the 6 lug set-up instead of changing to 5 lug, but I'm not aware if chevrolet used a 6 lug disc from the factory. AP