Bulkhead Numbers and Letters ?

[jdv69z]

So did the code also define the rear seat/carpet/interior trim that was to be installed, as Fisher did this part of the assembly?

[crobjones2]

I believe the numeral related to the X code.  There is not enough data to see if that follows

[JohnZ]

So did the code also define the rear seat/carpet/interior trim that was to be installed, as Fisher did this part of the assembly?

Nope. X-codes were unrelated to the interior - they defined exterior features. Interior features/colors/trim combinations at Fisher were defined on the UOIT sheet (Fisher's version of a broadcast copy).

[firstgenaddict]

Clearly a small data sample but it does look like "X" for black interior trim paint and other color code letters for non-black interior colors (by exception).  Black interior trim paint was very common.

Yes black interior trim paint for all the houndstooth combos, black dlx blk std, white std,
711,712,713,714,720,727, & 729   - should use a X
715&716  -should use a B
718&719  -should use a R
723&725  -should use a G or DG
721&722  -should use a LG

[Stingr69]

I do appreciate this thread very much.  This question has been on my mind for decades and it looks to me like the answer is finally here.  Thank you to all that participated.

-Mark.