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The way I mounted mine was using 4 1/4"x2" bolts. I centered the box and then drilled through the bottom of the box and then right through the rails. Inside the box I used a 1" rubber washer that fit tight around the bolt (to keep any chance of water from entering the box) and then a 1" washer on top of that. Under the rail where the bolt passed through I used a 1" washer and a lock nut.
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Kurt V
No more Porsches, but a revolving number of motorcycles.
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