yo,
Maybe this will help too;
See the 96 Bronco frame & body mount parts diagram at end of this reply message; it is by Ford @
http://www.fordparts.com/
Note that the Body Mount Insulators are shown as well as the brackets; some dimensions from that site for the 96 is (go thru the drill for your year)
Body Mount Insulator (Body Bolt) Cutaway Cab; 1 3/8'' I.D. x 3 13/64 O.D. x 1 1/4'' thick - upper (Left) pn 00154
Body Mount Insulator (Body Bolt) Cutaway Cab; 1 3/8'' I.D. x 3 13/64 O.D. x 1 1/4'' thick - upper (Right) pn 00154
Body Mount Insulator (Body Bolt); 31/32'' I.D. x 3 13/64'' O.D. x 1 1/4'' thick - upper (Right) pn 00154
Body Shim (Body Body Location No. 1); Shim pn 00145
===
Parts Break-Out & Locations (& Bolt Sizes) for 94 (other years are similar) w/Nomenclature;

"Check out View Z (lower R). It's not totally accurate because it omits the thick spacer, and there should be another washer between the Nut & the Spacer on top of the core support..."
Source: by Steve83 (Steve, That dirty old truck) at SuperMotors.net
IF THE IMAGE IS TOO SMALL, click it.
The rear bolts (view V) are 7/16"x14(NC) 6.5" long threaded 2.5" with a 5/8" head with large integral washer.
The 6 identical bolts are 7/16"x14(NC) 3.75" long threaded 2.5" with a 5/8" head with small integral washer.
The front bolts (view Z) are metric (no other details).
Note that the necked portion of the upper sleeve (part of the upper absorber) is designed to lock onto the lower sleeve (flared assembly nut) to hold the rubber in place on the frame on the assembly line. But it funnels dirt & water in around the 2 parts & the bolt threads, usually rust-welding them together. So the longer they're soaked with penetrating oil before disassembly, the more likely they are to come apart.
Once the bolt is backed out a few turns, spray more penetrant down into the upper sleeve to rinse the rust off the threads, and use a hammer & drift on the bolt head to separate the sleeves.
The core support mount (views U & Z) is different, and the bolt threads into it from below. It's virtually impossible to separate them, or even to unscrew the bolt. They usually have to be cut apart and replaced.

These are the basic parts of Ford truck body mounts (cab, NOT bed). Note that the necked portion of the upper sleeve (alone at the bottom of the photo) is designed to lock onto the lower sleeve (on the R end of the bolt) to hold the rubber in place on the frame on the assembly line. But it funnels dirt & water in around the 2 parts & the bolt threads, usually rust-welding them together. So the longer they're soaked with penetrating oil before disassembly, the more likely they are to come apart.
Once the bolt is backed out a few turns, spray more penetrant down into the upper sleeve to rinse the rust off the threads, and use a hammer & drift on the bolt head to separate the sleeves.
The core support mount is different, and the bolt threads into it from below. It's virtually impossible to separate them, or even to unscrew the bolt. They usually have to be cut apart and replaced.
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Locations, Info & pics in a 90
Source: by ChuckVA (Chuck, Da Bronco) at
http://www.supermotors.net/vehicles/registry/10180/29535