Then I used CJ/YJ windshield mount bracket that I got from 4Wheels Parts for about $23 bucks. Part # is BST 51209-01. This comes as a left & right channel. I marked the center of the top & butted the track together. Then mark the hole in the brackets & drill. I used sheet metal screws to attach the track to the brackets. The track brackets will sit on top of the factory 4Runner top seal. The track will over hang about 5" or more. Slide the top into the track. I then bent the ends down & formed it to the shape of the cab.