1969 and up Mopar C-Body with single-piston front disc brakes i think would fit if you got the spindles.
Junk yard parts detail with link to mopar action article
http://cbodydrydock.com/e107_plugins/fo ... .php?50615
you have fatter track rod ends thicker track rod sleaves and i don't know how you balljoints and upper and lower arms work
or
http://www.summitracing.com/int/search/ ... 4294942606
if you are handy and have access to a lathe
any caliper with a none radial mount tabs and 3.5 inch centers to the mount can be made to fit onto a mopar disk spindle
that means 90s toyota 4 pot sumitomo calipers off a hilux 4runner or landcruiser look for '94 '95 96
jag XJ 4 pot calipers (i have 2 Cores (need rebuild) which you can have for £40 + shipping or collect (most rebuild places take £40-60 quid a caliper off you if you can not supply the rebuild cores)
Austin princess (if you can find any)
obvioulsy the toyota parts will need imperial to metric brake lines made up.
if a calipers take banjo fittings there wre two types
one hollow banjo with a drilled bolt
the other a necked in and drileld bolt with a banjo that is a smooth cylinder inside.
you can not mix and match
and all of these will involve a spacer and already having the disk spindles with the 3.5 inch centres mount for a disk caliper
drum spindles tend to have small boolt holes for the drum back plate
a caliper mount can be made up to mount to them, thats how SSBC do it
but if you DIY then you need to find a hub/rotor and bearings that fit the drum spindle , with a rotor that has a top hat shape with appropriate offset to be decently near the middle of caliper travel. if you do this you must make usre that you use paired bearing halves to achive your hub mounting
i.e don't run the cone of 1 bearing with the cup of another. yes it might make it all fit but the taper will be different and it will bind and seize
any set up you use if the disk does not sweep the total surface of the pad must have the pad that over hangs the disk cut away.
you do not want the pads to stand-off the disc when worn due to them colliding againts each other round the side of the disk.
this happens with jag calipers on smaller disks
but would not be a problem with the big disks you would have on a C body
getting some disc spindles is key
measure the mounting and work from there
or splash the cash with summit
if you get SSBC throw away the pads and get some soft street pads
and be conscious that they used to have a track record of 1 size fits all for the master cylinder which meant in some applications its was either too wide in the bore or too narrow...i think too wide .
very little peddle travel and brakes that felt like a switch, off or on....hence no feel, combined with hard pads that don't work until hot ==== just like faded drum brakes without the left right pull
Dave