In comparing the differences between the US & German GT3 order guide, I noticed these German options which I can't quite figure out. I would appreciate any help from our German freinds.

567 Windschutzscheibe mit Gruenkeil (windscreen with ?)

XSL Sicherheitsbuegel (Is that the rear roll over bar?)

Is that different than the rear half of the full clubsport rollcage? Does anyone now the weights of the full rollcage and can it be retrofitted? Does anyone know for sure if it is welded or bolted into place?

Thanks
Peter