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Intel® Galileo Board and Intel® Galileo Board Gen 2 have different dimensions and also different mounting hole pattern. I've just measured the mounting hole pattern for both boards, I hope it will help you:
Mounting hole pattern for Galileo Board: 3.81 in x 2.50 in
Mounting hole pattern for Galileo Board Gen 2: 4.50 in x 2.50 in
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