Valiant to Duster disc brake/rear brake swap

you will need the upper control arms and lower ball joints along with the spindles. the prop valve for disc or adjustable would be a good idea as well.
valiant, dart, duster, demon all use the same rear axles. rear axle would be an easy swap, just a set of u bolts & shocks holding it in.
Thank you for the information. So I should be able to use the lower control arms that are on the duster already, but I will need to get Duster disc lower ball joints? Or should I order a set of 73/74 Valiant lower ball joints?