From time to time Ford engineers dreamed about installing IRS in Mustangs. The install had to be pretty much a bolt-on so they could keep the cheaper live axle under the cheaper cars while the higher end would get the IRS. I believe this is what made it into the Super Coupe.
The Ford IRS was in no way a copy of the Jaguar. Ford had diagonal lower arms, like my '70s Mercedes. The Jag arms went straight out from the differential. Ford used a separate upper control arm, again like my Mercedes, while the Jag used the halfshafts themselves. Hubs looked quite different as well.
