Where can i find angled Fence Panels from 6 ft in ht to 4 feet?

Just put up 6 foot fence along front of my yard. on either sides of the driveway. I cant seem to find the type of panel for either side of the drive way that starts at 6 feet and the top is slopped down to 4 feet... any idea what this type of panel is called?? where can i find them?