Jump Seats from '78 Nissan extended cab pickup are identical to rare early-80s Bronco 3rd-row.
I'm still not sure if these were a factory option, a dealer option on Broncos, or an aftermarket option. I've only seen 2 other FSBs with them, and both were '80-86 with matching upholstery, but that might have been custom-made.
They're surprsingly comfortable & secure, according to everyone who has ridden in them. Even the ones who rode here during some ROUGH off-roading.
The biggest DISadvantages to these are that I can't use an aftermarket molded cargo area mat, or the stock '92-96 bedwall panels because of their pockets. The right one won't work with an inside spare, either.

.

.

.

.