I think what he is talking about is the pieces that bolt to the Xmember & thwe frame. (on the outside of frame where the upper arms connect)
I removed the welded nuts & installed lock washers & regular nuts myself. I believe there was a difference in the bolt size. one was 7/16 & the other was 1/2 I think.
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Man rule #77...if you own a 67 stepside with a caddy 472 you will never be in danger of loosing you man card
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