Hi foks

I would need some help to identify my rear end to be able to get parts for it. What Year? What Car?
I drive it in my 55 1'st serie Pickup 1/2 Ton with a 350/350

GM, 12 Bolt Diff cap, 6 Lug Wheels, Diff casting 3896839, Brake pads are about 2 3/4 wide and the drumms have ribs

Hope that someone can help me with that because it's not easy to find someone in Germany to figure that out.

Thanks