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).
John, I received the flange today, please accept my thanks to you for taking the time out of your schedule to accommodate my project. It means a great deal to me that you took the time and effort to help me, and it's important to me that you know your efforts to help me are both recognized and appreciated. You have been and are both professional and considerate as well as a pleasure to work and associate with.