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The rubber mount has a grommet like that when its bolted down it mashes it in so it doesn't shift. I had a 67 that had a bad rubber mount. What i did was losen the rear two bolts and then i removed the bolt that had the bad rubber. I then raised the rear of cab with a bottle jack in center of cab just a little to take off pressure. I used my sawsall and cut it out. Keep the washers. I then got a rubber roller from a boat trailer and cut a piece off to the size of old rubber mount. Stuck in place,put bolt in and tighted it down and it was good till i got rid of the truck. I now have a 72 and have bought the new mounts for cab and radiator and for complete assy,was 175.
The cab mounts can still be purchased. You have a choice of regular or urethane. The urethane can start squeeking over time. But are more chemical resistant.
Generally, the body mounts are about an inch and a half thick when new. The best way to tell is to look for dry rot and cracking all around, if it's only 1/2" thick now with chunks missing or deep cracks, they're probably toast.
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