Yo 89bronco89!,
Banned member Steve83 wrote here; "All '78-96 rear benches are the same size/shape/frame."
For a YARD SEARCH on-line, I use;
Hollander
Quality Replacement Parts | Find Used Auto Parts | Online Locator
A yard that uses Hollander Interchange can search other yards and have it shipped including some Canadian yards.
"...For over eighty years, Hollander has been making the best tool for fast, interchangeable part matches. The new Edition Hollander Interchange contains more interchangeable options than ever before.
The Hollander Interchange provides auto recyclers and auto collectors, rebuilders, and others with the easiest and most comprehensive solution for identifying interchangeable auto parts..." See their yard Directory @
Seller Directory | Used Auto Parts | Hollanderparts
Can select a certain part, such as;

●Call For Price
Excellent Condition (Grade A)
Mileage 0
Four Lane Auto Sales
Rome, GA
Steve also provided:
The insulator commonly wears off the rear seat strike, so to reduce noise, it must be replaced. 1" heat shrink tubing is probably the smallest that will fit, but I was able to stretch this 0.972" enough to get it over the end. The next size up that I have is 1.35", which seemed too big to shrink down tight. These are 2"-long sections
&
"Bronco Rear Seat Hardware
Everything is identical from '78-96; the year labels are only to identify the donors. The plastic sheath on the strike bar can be replaced." by Steve83