I got a Ford dipping mirror from Redline components. It wasn't cheap but with the mirror rotated 180 degrees and the base located at the top of the screen, and offset off to the passenger side, it allows the minimum of blind spot when looking forward. Also I have a better view to the rear through the gap that the diagonal bar on the FIA roll bar leaves. Standard Caterham mirrors on the side screens and the coverage is pretty good. The ability to dip the mirror at night, especially on a motorway, is a great feature. The tiny stick on wobbly rear view mirror was consigned to the bin a long time ago.