A couple other uncommon options for Broncos:
Spot light
Sliding windows (80-84? option)
40 channel CB radio
Not too rare but uncommon is the locking hood release, and if we are right about the 85/86 having the black locking hood release that probably ~is pretty rare.
Then there are rare accessories like the behind the seat gun safe and Koolatron electric ice chest.
SHORT BED 4-DOOR DIESEL: 1986 F350 4x4 under construction-- 7.3 IDIT ZF5+GVOD
STRAIGHT SIX 4X4: 1981 F150 2wd to 4x4-- 300 I6 close ratio diesel T19, hydroboost brakes, Saginaw steering
BIG F: 1995 F-Superduty under construction— converting to 6.9L IDI diesel ZF5+DNE2