I have this for sale.

http://nx2k.dynip.com/thumbs/g20_stuff_for_sale/pages/G20_sunroof_windscreen_for_sale.htm

Mounts without holes or screws, stays on good. I didn't like the way that it took away from the clean lines of the G20. Not overly scratched, works OK, make me an offer via email to jay@nx2k.com. I'm also open to trades.