Fit how? Fit as in "I've got a drill, baling wire, duct tape, jb weld, half a bottle of Jack and forty unencumbered minutes before the Dukes of Hazzard mini-marathon starts, I'll make it fit" or fit like it belongs? It won't be pretty, but yes, you can make it fit. You can also put hubcaps off a 1996 Dodge minivan on a Porsche Carrera. Not something a lot of people are going to consider, but definitely do-able.
You obviously aren't exposed to high caliber redneck engineering on a regular basis. I have seen proof that you can mount any windshield to just about anything wth a handful of two inch deck screws. You lay it on top of the flyscreen and drive a bunch of deck screws right through both of them. Wouldn't even have to take them off the bike. Might want to put a couple into the instrument cluster to counter vibration.
(While I haven't actually seen anyone do this to a GTV yet, I have seen this method of mounting used on a couple of inexpensive Chinese scooters, with varying success, depending on what electrical parts or master cylinder or brake hose was driven through. Never a dull moment.)
look, look... my red neck, white socks and fridge full of blue ribbon beer should be enough to let all parties know that i am well skilled in the art of hillbilly engineering. hell, i own stock in duct-tape!
and, while, yes, you could make it happen with a fair bit of effort i think that a quote from chris rock sums it up best: you could drive a car with your feet; that doesn't mean it's to be done!
in all seriousness, OP you bought a GTV. enjoy it for what it is. if you want a windscreen sizable enough to propel a sailboat then maybe you should think about trading out for a standard GTS and making that happen-- instead of hacking up a handsome and desirable model of vespa.
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