Here are the plates that go between the floor and the tracks on my 65 buckets
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And the hardware to attach the floor plates to the tracks
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And the L and R tracks/floor plates on my passenger 66 bucket seat. The only difference I can see is the width between the 2 floor plates which I believe is due to the width lf the 66/67 seats
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And a comparison between my 65 outer plate and a severely rusted outer floor plate from a 67 Charger seat
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You can see the funny looking cutout in the Charger one; that’s how an owner can adjust the tilt/minor height of the seat relative to the floor