I am getting the original A body 8.25 for doing the build and swap of the 8.75, and he bought all the parts.
I don't have to shorten anything but my driveshaft.
Around here you can get 8.25's out of about anything Dodge rear wheel drive for $150 out of the pick a part, but they would normally have to be shortened and new shorter axles.
The Jeep Liberty has a narrower axle than most other jeep or dodge products so correctly backspaced wheels can work on A bodies.
AND they already have the disc brakes and even Sure Grips in some cases.