Since there is almost no information out there for these I wanted to post this. The rugged ridge spacers shown here http://www.amazon.com/Rugged-Ridge-11540-15-Mounting-Spacer/dp/B00390RLLY product number 11540.15 are 3/4" thick and have 4.5" center to center spacing between the holes. They are a quality product and are perfect if you are putting a big winch like the Badlands 12k into an ARB.