Without question EMPI manufactures the finest Dune Buggy windshields. All frames are a polished and anodized aluminum extrusion to provide custom looks and strength. Windshield frames slide over the top of the dash. The dimension given is the size of the opening to fit the dash. Frames only have a low and high dimension because you can have your own glass made which would then allow you to draw in the frame slightly. Frames can be ordered without AS-1 safety glass if local installation is available. Kits include mounting rubber, glazing vinyl and bottom brace.