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Don't bench seats from a wide range of trucks 67-79 fit the slicks? I saw a decent bench in a dent-side at the wreckers recently, thought about pulling it for mine.
What you can consider is reaching out to custom upholstery shops that can create a bench seat to your specifications. They can replicate the original design or create a custom seat tailored to your preferences. I usually opt for this option when it comes to restoring an old car.