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).
Like your Z, this site is always underconstruction. :-)
Velo Rossa™ Spyder Rebody Kit
John, Parts received and they are AMAZING!!!!! Seriously impressed. I'll be sure to pass your site around, seems to be an under-known parts source for being as high quality as it is! Thanks again, your customer service, contact and speedy email responses were excellent and greatly appreciated! Have an excellent holiday!