I can confirm that the GTX3584RS will fit the Ford 1.06 turbine housing. The housing needs to be machined out at the turbine inducer side by 4mm and then it will fit.
The specs are incorrect on the Garrett website (maybe deliberately). It uses a different turbine and compressor wheel and also has different trim values. It's a genuine upgrade from a GTX3582R, more flow potential on both hot and cold side of the turbo in a 35 frame package. I just bought one for my new engine build, should spool just as fast if not faster then a 3582, and make more boost everywhere too. Looking forward to taking this to 600RWKWs