Since MAW came out on top with the Plexistar 2, I checked them for the Slipstreamer Spitfire.  Here's what I found at http://www.mawonline.com/slipstre.htm (a little over halfway down the page).  I believe you want one of the 7/8" kits.

Check out the price on the clear shield!!

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Slipstreamer S-06 Spitfire Windshields
Great protection and devastating style come together in the Spitfire Sport Shield. Constructed of 1/8" tinted acrylic with red graphics. Fully adjustable and mounts/dismounts in seconds. For round or rectangular headlights. Height: 15" above headlight; width: 16".

Slipstreamer S-06 Spitfire Windshield PHOTO

Order # Price........ Description......
(48824)     $41.95 Slipstreamer S-06 Spitfire Windshield with 7/8" Kit Clear  
(01169)     $49.95 Slipstreamer S-06 Spitfire Windshield with 7/8" Kit Tinted  
(62393)     $45.95 Slipstreamer S-06 Spitfire Windshield with 1" Kit Clear  
(62395)     $49.95 Slipstreamer S-06 Spitfire Windshield with 1" Kit Tinted