D.... I don't know much about topcases...
But at least here in the US, in the flyer my dealer gave me, there is an "official" Suzuki accessory windscreen available for $69.95 usd.
Part # 990A0-30000
The description reads:
"This double bubble style windshield gives the Bandit standard sport bike even better cruising comfort."Jeez, who writes these things? Some Japanese dude? The description raises more questions and creates more confusion than it's worth.
Anyway, it's a lousy pic but it doesn't look like a "double bubble" to me... it looks a lot like the stock one only about 4" taller. It doesn't say whether it comes in anything other than clear.