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The O-rings are two of two different sizes, we get ours from Porsche as they are very inexpensive.
I don't know how you "crush" one of these coolers, they are pretty sturdy, and we have pulled and installed a lot of engine's over the years without any issues.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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