just any ram van with a magnum worked. never tried the one from a jeep, not sure how easy that would be to find.
there is a catch. I have a post on it somewhere.
the belt that the original mag used won't work, and the van one doesn't quite work unless you replace the idler pully too.
turns out the van setup uses a different a/c pulley, and it throws off the whole setup if you try to use a truck mag with a van ps pump.
so I found the 5.7 hemi idler pulley is smaller and is a direct swap out for the idler on the truck 5.9 and brings the pulley sizes in line so you can use a standard belt.
here is my post on the issue.
https://board.moparts.org/ubbthreads/show...rue#Post7329831