The bolts protrude from the underside of the brackets sufficiently to attach the brackets to the car's cross members. I have a rav4, the cross braces are original. I had to cut 4 screws about half an inch to install them. I have an angle grinder. However, the bolts were so close to the car roof that they peeled the paint off the car after driving. Seriously, this is such a rookie mistake in terms of design.
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