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Doing a front end rebuild here in a couple months. Rockauto lists two part numbers for lower ball joints on my '07 NNBS 4x4 1500 LT Z71 - K6541, which looks to have serrations on the part that presses into the LCA, and K500007, which looks like it has a smooth press surface. From reading the descriptions it looks like either should be correct for my truck but they are obviously different, which do I need?
 

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K6541 is for steel control arm, K500007 is for aluminum arm.
 
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