I have them on mine with the stock maverick, side clearance is minimal but that won't change with the extreme. As far as clearance with height i don't believe the drop brackets change ride height. Didn't measure before or after but lot's of guy's run them and never heard of a problem.
I get rub/wear when the track gets out of allignment, but its minor. Just ensure to use either rounded head rivets or rounded head hex bolts. Then place the rounded/head toward the track in/side. Then if it rubs like mine sometimes does, the wear on the track is minimal, and doesn't chew it up.