Hello all. I am in need of new backing plates. I have a 12 bolt i was told was from a 67SS. I am finding the plates however the 4 mounting holes are a little offset. The flange on the axel has the 4 holes at a square. I found plates at The Parts Place and called them. They pulled a plate and the mounting holes are in fact offset. Where can i purchase the correct plates. The casting #s on my axel are FP0116C and 3894860 the best i can tell. Can someone please send me the info i need to purchase new backing plates. I have exhausted my brain doing internet search. Thanks