If A Car Came With Heavy Duty Suspension....

Jim Lusk said
Every A-body heavy duty spring pack (this does not include hemi cars) I have seen was the same right/left, including my old 66 Commando/4sp Barracuda, my 68 GTS, and the 67 Rallye Dart we parted out in the early 80s.
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Same here, "67" 4 speed Formula S, "66" 4 speed Formula S, 68 Automatic Formula S. Six leaves, same part number embossed into the smallest leaf.