If you look up in your heat exchangers, we'll see black protectors on each side of the heat exchanger (in the groves). If you install studs, you should put on thicker protectors to keep the lugs from slapping the exchangers and having the studs put a costly hole in the exchanger.
If you have studs that stick up past the lug about 1/4 inches, you should install 1/2 or 3/4 inch protectors.
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