So while working on my leaf springs it’s interesting as the different things 66 springs have vs 67- up springs. I had already learned the clamps on a 66 were one year only, but the zinc liners are also one year only. The kits that are available for the most part are 67-71 style, I think that Frank B makes a 66 kit. So I’m going to share a few of those details in the thread.
Matt

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the 66 springs have zinc liners that are 18” long vs the 11” liners in the 67-71 style kits

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the 66 specific clamps with a round hole.