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The lower "washer" that holds the rubber bushing under the cross beam has a tube that goes up into the center of the rubber bushing that is threaded for the bolt to capture. That IS your nut on the rear mounts.
Look at the front mounts for rust. They are a problem area and if rusted, will put all the weight on the rear causing it to sag like that.
Sorry but I have to disagree with this. I've seen many many rear cab mounts that sag that bad and the front cab mount perches were just fine. When the front cab mount perches fail like that, the weight of the cab nor the forces imposed on the mounts does not change. The cab doesn't magically get heavier in the back. Those rear cab mounts are smashed like that due to normal age, environment, wear, and tear. The front perches are just trashed and more than likely you could probably go out and move the cab up and down on those front mounts.
Again, sorry, I don't want to start poo; just my opinion.
Actually, because there are three mounts on each side, the failure of the middle mount will cause the cab to settle. The inner fenders are quite hefty braces transferring weight to the radiator support mounts, while the cab structure itself transfers the weight to the rear mount. Trucks that lose the strength of the inner fender don't do this, but then the bump line turns into a really shallow vee and the panel gap between the fender and door becomes uneven (wider at the bottom than the top). My truck did this on the passenger side, the rear of the cab was sat lower on that side. The inner fender was under quite a bit of tension when I released the three bolts at the firewall.
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