I have seen a lot of aftermarket posi units around. As for factory stuff though, the pickings are pretty slim.TheRktmn said:Mark is right. My father's 66 Stang has an 8" rearend and he's gone through hoops trying to find a posi unit for it. He's to a point now where he just grabs 8" pumpkins no matter what they have. H know he has 3 now: 3:00 posi, 3:50 open (figure THAT out!) and a 3:00 open and a 4:11 gear set. This is after collecting parts for over 20 years. 9" are definitely easier to find!