68 and up front replacement springs are not ground flat on top like the factory springs. The replacement springs are like the 67 and earlier springs on top. I use a 68 and latter spring in a earlier car because there is more selection and you can get higher spring rates without buying aftermarket springs.... The back springs are different. The 67 and up use a pig tail on both ends, the 66 and earler use a pig tail on the bottom only.
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