Breezies Wind Deflectors
Breezies have been around since the 1950's and just clip onto your quarter light windows to act as a wind deflector if you want more or less air inside, but also look pretty cool.
They have a clip that will just secure onto the frame so no drilling required.
Made from tough poly carbonate with stainless steel clips and available in a selection of colours and in polished stainless steel.
These will fit onto pretty much all classic cars that have a quarter light frame.