Here ya go: http://www.ebay.com/itm/201221529225?ru=http%3A%2F%2Fwww.ebay.com%2Fsch%2Fi.html%3F_from%3DR40%26_sacat%3D0%26_nkw%3D201221529225%26_rdc%3D1
FYI: Posi-trac is a GM limited slip differential. Mopar's limited slip was called the Sure-Grip.
Good luck with your sale.
