Assuming you are flange mounting the radiator and not knowing what about the rubber washer was not robust enought....
If you don't like 1/8, stack two of them. You may want to use a nylon lock nut so as to get the right rubber squeeze/isolation effectiveness. If you torque it all down, you take out the cushion. Don't over worry about this. The welds on the radiator mounting flange are strong. The truck has suspension and rubber tires. The two hoses hold it also.
The only slight protection issue is a large shock load. NOT "vibration". I don't know how the original radiator was isolated. I see pads available for AD.
Right is right, even if everyone is against it, and wrong is wrong, even if everyone is for it. - William Penn
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