I would think your best bet would be to find some seats that already have headrests... If there were ad-on optional units, I doubt they would have the sliding tracks that the later ones have. You should be able to find correct looking seats off a '68-70 car. Maybe '71. Somewhere around there they switched designs...
Of course, if yours is an early Jensen built car, the seats I mentioned won't be the same, but would probably bolt in fine. you can also fit seats from a last series production e or es with only minor track/mount adjustments. I've got those in my '65, and I love 'em.
-Matt
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