LM Plastics Ltd supply wind deflectors for the Street Ka.  These wind deflectors are available in 4 colours; clear, dark tint, pink tint and blue tint.  The wind deflectors cost £39.99 and you can buy online from their website.

 

From the LM Plastics website. "Developed and manufactured by ourselves. Precisely laser cut, shaped and totally polished from 5mm thickness perspex. Pre-drilled, so it fits straight on. No cutting or trimming, fitted in minutes and stays in place whether the roof is up or down. This item stops the draft that occurs when the roof is down. A great upgrade when motorway driving. No more cold draft or loud road noise."