The knuckles would be harder to use because of the backing plate and parking brake shoe. For the sake of simplicity, it's just easier to buy the whole knuckle. Most junkyards won't even charge for the backing plate and parking brake shoes. They consider it as part of the knuckle.
As far as the hubs, they're hard to get off. It's just more convenient to have a full swap.
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2̶0̶0̶3̶ ̶P̶o̶n̶t̶i̶a̶c̶ ̶G̶r̶a̶n̶d̶ ̶A̶m̶
1994 Olds Cutlass Supreme
2̶0̶0̶2̶ ̶C̶h̶e̶v̶r̶o̶l̶e̶t̶ ̶C̶a̶m̶a̶r̶o̶
1996 Infiniti G20
1993 Chevrolet Lumina Z34
1989 Buick Regal Limited
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