Yo Falcon1965,
Welcome and great purchase!
Body style breaks are 78-79, 80-86, 87-91, & 92-96.
See this Partial Ford Parts Catalog 87-91 & 92-96 Bronco @
https://www.fullsizebronco.com/threads/parts-catalog-87-91-92-96-bronco-partial-by-ford.195456/
History, 78-96 Bronco; Ford Truckin' Magazine; 1997 winter issue Source: by Trent R;
87-91, In 1987, the body and drivetrain of the fullsize Bronco changed, as it was still based on the F-Series. The new aero body style reflected a larger redesign of many Ford vehicles for the new model year.
The body was restyled and featured a more aerodynamic look and Euro-style headlamps."
PCM was changed when Ford went from two-digit to three-digit EEC IV Self-Test codes in 1991 to service the increasing number of service codes required to support various government On-Board Diagnostic (OBD) regulations. The phase-in from two-digit to three-digit codes started in the 1991 model year and is largely complete except for some medium/heavy trucks that will retain two digit codes through the 1994 model year.
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.
If a specific part isn't listed, search again for the next higher assembly.
For another good overview of parts Interchangeability, see Jeff's Bronco Graveyard @
1980-96 Ford Truck/Bronco-Broncograveyard.com
Starting in 90 5.8 Broncos received the E4OD, 302s still had the AOD.
Confirm with;
The manual transmission is M5OD
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Here are the 1990 Bronco Pre-Delivery Shop & Electrical & Vacuum Troubleshooting Manuals (EVTM), Partial by Kingfish999 in Google Drive @
1990 Ford Truck service manuals - Google Drive
&
1990 Ford Truck Emissions Manual.pdf by Ford via member 90.CaliBronco in Google Drive @
1990 Ford Truck Emissions Manual.pdf
Suggest you download both for faster scrolling and to use the table of contents index.
1990 Ford Bronco Brochure by Ford via Dezo's Garage @
https://www.xr793.com/wp-content/uploads/2020/07/1990-Ford-Bronco.pdf
Haynes Red Manual for 80-95 Bronco & F Series @
Hanes guide 80-96 bko f series.pdf found by Mrs BroncMom!