Need sure-grip for 81/4

Does anyone have a sure-grip or other posi unit for an 81/4?
PM me if you do
Thanks and God Bless
Bruce

Got any U-pull yards in your area?

The rears are the same from the early 70's through 1994 or so. Find a Jeep, dakota or something of that like with the same rear and preferably 3.31 gears or lower (3.55 3.73 etc.)