Well the good news is that the '68 spindle will bolt on, the bad news is that the '68 spindle was used with the Budd brake system which is very hard to find parts for. These dual piston calipers are usually going to need to be sleeved as part of the repair process and that is expensive. Front disc pads are also difficult and expensive to find. An even bigger problem is the lower ball joint that must be changed to accept the Budd brakes, those are all but non existent. Do not buy the '68 spindles unless you can find the complete system, rotors for that system are also expensive..
A more economical choice would be '69-'72 Plymouth, Chrysler or Dodge spindles. Those use a single piston caliper and you can use the existing drum brake ball joints. Parts for these are generally available. Another choice would be the '73 spindles for which rotors and pads are readily available as they are the same as the 1/2 ton vans and pickups Calipers for all of these older Mopars are starting to be hard to find, so you might want to find a parts car to acquire all of the parts you need. You will need a '68-'70 Bendix dual diaphragm booster to power the disc brake setup. Note that some '71 models also used the Bendix booster as did some '72 police cruisers and vehicles equipped with the heavy tow package. Be sure to also buy and after market brake portioning valve to re-balance the brake system. Plymouth, Chrysler (Except Imperial) and Dodge all use the same rotor and pads for '69-'72, Calipers are the same from '69-'73. '73 rotor must be used with '73 spindle.
Dave
