Variable Rate Cargo Coils
These are Moog CC501 rear springs. They will fit in the back of 68-72 A Body cars as is. The top of the spring has the coils wound tighter than the bottom. These springs can also be made to fit the rear of a 64-66 A body by using a cutoff wheel and cutting the pig tail off the top. If you cut the end of the spring even with the spring that came off the car, the spring will be the same height as the stock 64-66 rear spring. This should raise the rear of the car a little bit as the spring won't compress as easy as the stock springs.
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