Those spindles look used.
I would buy from a board vendor first,... or call
www.earlyclassic.com.
You will also need a disc brake M/C and prop valve.
You will have to fabricate a few new brake lines.
The rotors in the ebay add are 6-lug and will only work with 1971 and later 6-lug "disc brake" wheels. (to clear the calipers)