Just a few pics of my homemade tail tidy and rear light mod,light mod was from a pic on here.
        
 I didn't do any measurements though,just started cutting and trimming till I got a result I was happy with.
         
        
 Starting point
         
        
 
         With the numberplate mount and light removed and some cutting done
         
        
 
         
         
         Light unit trimmed down and speed clips fitted
         
        
 
         Light unit turned upside down and slotted inside the undertray
         
        
 
         
         
         Home made tail tidy
         
        
 
         Fitted
         
        
 
         Finished results
         
        
 
         
         
         Just need some micro indicators to finish the job off