Posi-8.75 rearend for 1966 dart 5on4

I have the axles but am hoping for the posi-rearend. Maybe I'll get lucky and it will be nearby in Florida where I live. Even if you don't have one, do you know someone who does? I've had this car since 1969. My 7&1/4 is shot. Rear bearing in Transmission seized the drive shaft and twisted it in two. That broke my transmission casing, bell housing and damaged the rear end. Also put a couple of cuts in the floor pan as I was coming back from Md. Happened all in less that 2 seconds.