Yes, very expensive at $125.
My understanding is that the same boot was used for both the 4-speed overdrive transmissions from 1980 - 83, as well as all transfer cases from 1980 - 86. At least that's the way I read the snippet from the catalog, below, which is from our page on Documentation/Interior/Boots.
Perhaps Shaun can tell me if I'm wrong?
Gary, AKA "Gary fellow":
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Dad's: '81 F150 Ranger XLT 4x4: Down for restomod: Full-roller "stroked 351M" w/Trick Flow heads & intake, EEC-V SEFI/E4OD/3.50 gears w/Kevlar clutches
Blue: 2015 F150 Platinum 4x4 SuperCrew wearing Blue Jeans & sporting a 3.5L EB & Max Tow
Big Blue: 1985 F250HD 4x4: 460/ZF5/3.55's, D60 w/Ox locker & 10.25 Sterling/Trutrac, Blue Top & Borgeson, & EEC-V MAF/SEFI