The factory memo does not go into much detail other than to say that KAISER CUSTOM materials were used in around 10,000 SPECIALS. There was no change in price for the higher grade upholstery, etc compared to regular 1948 Kaiser Specials. There is also no indication in the document as to use of the Special Order Code number (888) and a "K" number in the SPEC-FO header of the body tag on affected cars.
I can't dig the document out as all the K-F and Willys stuff is already packed for the move & won't be accessible until probably sometime in November. Barbara starts her new job in the Seattle WA area October 12th; we expect to be on our way there at the end of the month of September, 2015.