My 68 8" stock rear chunk is worn out but is still installed in my car. I have access to a cheap 65 rear chunk in good shape. I've searched the forums but cannot find any saying whether these 2 rear chunks are interchangeable. Can I do a direct swap, putting a 65 stock 8" rear chunk into stock 68 8" rear end? And will the U-bolts for the driveshaft connection still be in the same place? Thanks