Ford offered a roll bar, also known as a rally bar, for both the Broncos and the F-Series pickups. But there appears to be four different versions for the F-Series, and the 1989/E9 version was available in both black and brushed aluminum which kinda makes it five:
- 1980: E0TZ 9951868-B: In the PN listing this is shown by itself, meaning not as part of a kit, and for 1980 trucks only. I assume this would have been in kit E0TZ 99518K00-A initially, and I'm guessing that it looks like its brother E0TZ 9951868-B, which is probably much the same as the one shown in the 1981 accessories catalog, meaning its rear bars went down to the bed ahead of the wheel well.
- 1981 - 85: E1TZ 9951868-A: This is part of Kit (Roll Bar) E0TZ 99518K00-A, which means we have a 1980 kit with a 1981 roll bar. I'm guessing that there was an issue with E0TZ 9951868-B and it got replaced but they didn't change the kit's #, although you can't mix and match rear braces as they have 1981 #'s as well. This is surely the one shown in the 1981 accessories catalog with the rear bars going down ahead of the wheel well.
- 1986 - 1988: E6TZ 9951868-?: From the Kit (Rally Bar) E6TZ 83518K00-? and this is the one shown in the 1986 accessories catalog with the rear braces going down behind the wheel wells.
- 1989 - on: E9TZ 9951868-?: From the Kit (Rally Bar) E9TZ 83518K00-?, and this was avail in black & aluminum. This is the one you show, and I think it is different from the 1986 version as there doesn't appear to be a bolt holding the lower portion of the rear braces to the upper portion, as there is with the 1986 version.
Anyway, here are the part numbers from the master parts catalog, although not everything appears to be listed for the earlier bars.