Bittersweet Mist is a 1971 only color. Sort of a burnt orange with some gold metallic. Here's a pic of one of my cars that's that color.
I've got a set off a 72 GS 350 that I will sell I will dig them out tommorow and check condition I do know one mirror [glass] is cracked let me know if your interested
heres what I found John, both mirrors both gaskets just missing drivers side bracket but I'll keep looking, passengers side mirror is cracked