Mine has the nuts crimped to the roof panel. I just took one of the bolts into lowes and bought shorter flush mount screws for them. I siliconed the underside of the screw head and tightened them down. Pick up some body color touch up paint to help hide them. Mine kind of looks like I bedazzled my roof.
Make sure you get it aligned after the lowering or you will negate the reduced wind resistance because of the increased drag from the tires.
Sorry, mine is old school....came with a mechanical fan
