Hi every one ! i have a 12bolt posi out of a '66 Bonneville (bop not chevy) and i need a new pair of thrust washers that fit between the spider gears and case .They are different from normal open diff 12 bolt washers as the shafts are different diameters ( the posi has a smaller diameter shaft than the open diff ) ...where can i get a pair of these washers ? ive looked all over the net and i have just contacted Fabcraft who sold me my 3.55 gears so we will see what happens there . If any of you Pontiac expert guys have any other ideas please let me know ....its the only thing stopping me from being out !! thnaks guys , jason