Before putting on the batwing I had a MS Fats with the Cobra lightbar. I also needed the extension. Went with a 4 inch but the 3 inch will work.You'll need a headlight extension to run that lightbar with a MS windshield....The spots on the Cobra lightbar are 4-1/2" deep, and interfere with the windshield.....I ran into that problem in 2007 when I bought my bike...I sent the Cobra back and went with Hondaline and no interference issues with that one...