I have a 66 K-20. I've looked into this. NO ONE makes a kit for it. I tried changing the front to a newer design spring, with the associated fabrication. I got it to work, but I found out later it would have been MUCH easier and cheaper to have custom springs made. Anyway, I am having the rear springs custom made for me with the appropriate lift - I'm using Alcan Spring in Colorado, about $200 a spring.
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