Heres some bucket seats out of a 1966 Dart. My understanding is they'll fit other 66 "A" bodies such as Barracuda and Valiant and possibly 1967, not sure.
That is correct - the frames are correct for other 66’s that take buckets. Upholstery is of course different by models. The frames are also the same as 67 A Bodies AS WELL AS 66/67 B Bodies with different upholstery by models. You might advertise them on the B Body forum for wider exposure.