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They are fundamentally different designs.
The Aero uses 2 lower trailing links with a single upper link that perform double-duty with the 2 lower trailing links to locate the axle housing both laterally and rotationally. The housing will have only a single mounting point for that one upper link, in addition to the 2 for the lower links.
The Crown Vic rear is a little different; It uses the more traditional 4 trailing link with (I think) a Watts (or Panhard) lateral link. The combination of 2 upper and 2 lower links provide fore-aft and rotational location of the axle housing, while the Watts link provide the lateral location. So its rear axle housing will have mountings for the 2 upper arms and the Watts bell crank (or Panhard pivot) in addition to those for the 2 lower links.
You will have to install an upper mounting point for the Aero's 3rd link onto the CV's rear axle (and maybe remove the mounts for the CV's 2 upper links) to make it work on the Aero, or convert the Aero's rear suspension to use the 4 link plus Watts link of the CV.
If you want the disk brakes, I think you may be able to find other vehicles that have brakes that will fit with minor modifications. I think maybe some of the Explorers may be adapted without much work.
But ultimately, rear disks on an Aerostar will not be too effective, since most of the braking is done by the front due to the weight transfer. They will try to lock up the rear tires more readily.
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