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Hmm... well since you report that the rest of the leafs in the set are not factory all bets are off IMHO and we can not assume that these leaves (the ones with the Falcon engineering numbers) came with the car originally either. I think that we can disregard the happenstance that the spring markings are the same as what was used on Mustangs. Checked the 67 Master Parts Catalog and even by then these springs had been dropped so I can't see what the leaves original came on or any ratings.I think I would start looking for the C4ZA - S springs if it were my car.