I posted about this in the WHYDTYTT thread, and some of the guys there were pretty close on guessing what I purchased, if not exact.
Below is a 1980-only transfer case shift boot, used in conjunction with the stainless aluminum trim ring. Ford nixed this for 1981 for unknown reasons, and all E0TZ-7277 shift boots are the 1981 versions despite the E0 in the part number denoting 1980. If these had a part number, I've never found it. I've also never found close-up photos of the boot itself but have seen plenty installed in 1980 trucks. I've been looking for one of these for over 10 years, so it feels good to finally have one. I'm still on the hunt for the transmission version. Due to no info, I'm not sure if there's a difference although it looks like there is.
With the trim ring:
Pictured with another one-year only boot, the 1987 version (right side). Notice how there's only 4 folds, where most 1982-1986 shift boots have 6.
What this boot looks like installed in a truck: