Here is an article that answers a lot of questions about what fits what in our trucks.
Frequently Asked Questions (FAQs) on Adapting Major Components of 1948 to 1960 Ford Trucks .: Articles
Here is an excerpt from that article.
Be sure to look it over for more info than I copied here.
Here are some measurements that you might want to consider when looking for a new seat.
Inside cab width from door panel to door panel (where the seat bottom is the widest)
o 1948-1952 F-1 = 53.5 inches
o 1953-1956 F-100 = 58 inches
Distance between the door handle tips
o 1949 F-1 = 51.5 inches
Distance between the fat part of the door handles
o 1949 F-1 = 45-5/8 inches
Distance across the cab at the rear door post
o 1949 F-1 = 57 inches
Distance from door panel to door panel
o 1957-1960 F-100 = 62 inches
Distance from door handle to door handle
o 1957-1960 F-100 = 56 inches
Stock bench seat width
o 1960 F-100 = 59 inches
There seems to be an issue (particularly found by older members of the forum) with the space between the steering wheel and the seat shrinking over time, resulting in limited intestinal accommodation. Fortunately the newer seats use a different type of spring so they tend to be thinner in the back. This provides more room in that area. This is something to think about before you buy a big, fat seat out of a Cadillac or Lincoln or some other land yacht. With a newer seat, you will usually pick up storage space under the seat bottom as well.
The following suggestions are based upon input from this forum. There is also an article in the August 2004 issue of Classic Truck that deals with this subject and contains many pictures of the suggested alternative seats. Note that we are not spending time discussing bucket seats. Once you ditch the console, you can pretty much fit any bucket into any truck, although generally you'll end up with a built in headrest sticking up in your back window.
1948-1952 Trucks " Seat Width No More Than 52 Inches
2000 Ford Escort buckets
Mid/late 1980s to 1996 Ford Ranger or Broncos
o 60/40 bench or buckets
o Perfect fit
o Used by many
o Bench is 51” wide at it's widest point
o Back folds forward
o No headrests to poke up in the back window
o 2-door donors fold, 4-door donors don't
o Very popular with members of the forum
1989 through mid 1990s Ford Explorer
o Buckets or 60/40 bench
Middle or rear seats out of a 1996 Dodge Caravan
1996 and newer Chevy Astro Van
1996 and newer full sized GM van middle or rear seats
1995 and newer Toyota Tacoma
1994 and newer Chevy S-10/Sonoma