yo,
edit!
My Comcast cable just froze up again due to .000342" of rain
So look up dimensions for the 79 shortbed stepside and compare to;
Bronco Dimensions; 78-79 25.5 Gallon, 31 7/8" x 22 1/4" x 12 3/4"; 33 Gallon, 31 7/8" x 22 1/4" x 15 3/4"
..
came with and w/out "emissions Hole"
80-83 25.5 Gallon, 31 7/8" x 22 1/4" x 12 3/4"; 80-89 33 Gallon w/2" Sending Unit Hole, 31 7/8" x 22 1/4" x 15 3/4"; 90-96 33 Gallon w/3 5/8" Sending Unit Hole, 31 7/8" x 22 1/4" x 15 3/4"; Weight, 32 Gal. in 88-96, 31.0 lbs
Source: by spectrapremium.com
SPECTRA SHOWS; F series has 19 gallon (34 3/4" x 27" x 8 1/8"), 20 (60" x 14" x 13 1/2") & 38 (34 3/4" x 27" x 13 3/4" ), rear & side & tank(s);
see
http://broncograveyard.com/bronco/c-1301-side-fuel-tanks.html