2002 mustang GT rear end in duster???

hey guys, wondering how much would be involved to put a 2002 mustang rear end in my duster? not worried about custom driveshaft but for $250, disc brakes, posi, and a nice 3.73 gear ratio i'm having a tough time thinking about an 8.75:( I realize i would have to reweld spring mounts but what about width is this thing even feasible AND advisable? thank you all in advance! -Dan