I have been searching for months now for a date correct and casting 3894939 12 bolt Posi for my 1967 Chevelle SS 396 convertible restoration project. The car is a solid restoration to bring back to build sheet it was somewhat of a barn find. A needle in a haystack. It has zero rust, original floor pans. I mean not a spot of rust with only 20k miles on it. All the options AC , power locks, windows brakes, sterling, cruise, tilt wheel, 4 speed Muncie. The only damage to the car after media blasting and being put on a rotisserie was 2 tiny door dings on the passenger side door. The only problem is at some time while it was sitting someone replaced the 12 bolt with a 10 bolt. They even left me loose bolts and a extra brake line. So at this point I could use help finding the correct 12 bolt posi or what should I replace it with to keep the car as original as Posible?