Hello Sandro and welcome to these pages, glad you made it..
Sorry your adapter is taking so long to reach you! They have never been across the Atlantic before, so they're still learning the route!
Frustrating that your S2R has a plastic shell. It sounds very similar to the one fitted to the Sports Classic, which is a different size again to the Bosch, but still not 7".
Have any other S#R owners got plastic headlamps? I'm just wondering if these were fitted as standard to the S#R range? It would be nice to get to the bottom of it.