Many thanks John. My body / interior codes are 63B & 6A (interior decor & 'black vinyl luxury bucket seats' with the solid vinyl material, ie
not comfortweave/knitted vinyl).
Reply #1 of that thread you kindly pointed me at is interesting - I had read somewhere else that 'standard' seat covers did not fit on 'deluxe' seats. So I had assumed that the seat itself was different.
I had however noticed that the seat that I have looks very similar to a 'standard' bucket seat - but with the hard back & side trim added. So if it is the case that the interior decor option simply adds the trim, and the seat itself is identical, I can use the 'standard' seat covers on my seat. (Which would be why the NPD link you kindly provided points at standard bucket seat covers
I hadn't knowingly equated comfortweave with deluxe & can see that comfortweave was available on non-interior decor cars. However some of the suppliers do seem to equate those terms - the scott drake catalog shows a 'deluxe seat upholstery' set for 67 which only comes with comfortweave.
In the end I'm guessing that Ford didn't use the term 'deluxe' and that the separate options were interior decor (Y/N) and comfortweave (Y/N) all of which used the same seat frame. Is that correct or have I confused myself even more?