This piece is used on both the Velo Rossa™ kit and the Z Spyder™ kit. It covers the cutoff edge of the roof to help protect your noggin during ingress/egress, and cleans up the look of the windshield frame. It can be bonded on with panel adhesive; or even with body filler, since there is no structural loading on the piece (especially if you aren't using a convertible top).