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Are the front spindels for a 55 the same as a 57?
 

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As posted, there is the 4 bolt vs. 2 bolt deal.

But you do not need the two smaller upper bolts, so they are functionally interchangeable.

The braking force is taken by the big upper anchor bolt, and the two large lower bolts that also hold the steering arm.

The little ones are really along for the ride. I guess you could call them an assembly aid. Chevy must have decided that the cost of that convenience was way higher than its value. And they were right.
 
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