I also have a 68 Formula S 340 that was originally turbine bronze. I bought a die cast model of the car that looks identical to the one in the add at the Walter P Chrysler museum a few years ago and would really like to put it back to that color if I ever restore it back to original looking some day. Mine is a fairly early build car which would explain no headrests.
Not to hijack but, were the red inner fenders an option as well? Did they have their own fender tag option code?