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I worked as a mechanic in a logging camp years ago (many). Radiators and supports were a constant problem as was all the front sheet metal. We would add springs under the radiator supports and under the nuts that secured them.(similar to the GMC drawing) on any newly acquired trucks that didn't have them. I remember the foreman coming by with a quart of stop leak for me to add after I'd installed a newly re-cored radiator. The radiator on my AD Chev pickup had begun leaking from the corners and he suggested that after I had it repaired that I only use three bolts to secure it: two on one side and one on the other. The radiator survived but eventually the support hoop that holds up the whole front end cracked between the two bolts that support it. I gusseted it never had a problem after that but I did add the springs like on the big trucks. I also spent a lot of time welding cracked fenders and mirror brackets.