Front spindle hubs?

Are you talking about to switch to disk brakes? If so you would need the disk spindles and caliper mounting brackets.
There is a kit out there from scarebird.com for $105 that converts your drum brakes to disk...you have to cut the hub out of your drums and use toyota previa rotors with chevy celebrity calipers...all in all its about 250 bucks. But only 10" rotors.