Interior question (pics)
I've never heard or have seen a carpet delete option either, although I am sure anything is possible. I have owned about 9 or 10 67-69 fastbacks. All of my 67/68 cars had foldown rear seats, although not all had the carpet on the sides of the compartment. They all had the carpet on the bottom, and trunk divider panel. All had the trim pieces on the trunk divider panel. Adam is correct that in 69 the fold down rear seat became an option. My 69 M code has the non-foldown rear seat. Just my .0214ยข (thats Canadian of course).
Grant