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Your riding situation sounds identical to mine. I've got the good people at Rose Farm investigating the Moto Guzzi-branded Cali 1400 "sport screen" (~8" x 13") I've seen online, but as with many accessories, nobody is certain if this product actually exists. I'll keep the forum posted... and thanks for the photos.
Looks too vertical. Did you try laying it down a bit?
I bought the Moto Guzzi windshield for my custom...No complaints so far.Steve
I'd like to see the sport screen installed as well, if it exists.