You people who want double wishbone IRS might want to check underneath a - shock horror - Pantera! Double wishbone, outboard disc brakes, trick sliding half shafts (so no bind) and aftermarket billet wishbone/A-arms available too. For custom Quickchange Jag style IRS try Darrell Zip at Zipper Motors -
www.zippermotors.com. For Ford 9 inch based IRS try Kugel Komponents, La Habra California or Gary Heidt at Heidts in Wauconda, Illinois - isn't this internet thing grand!