Nothing about that kart says Manco to me.
Someone will be able to tell you. Meanwhile, just buy it!
If I was going to take a shot in the dark, I'd say maybe Carter Bros, but I really think it's like a Sears or something.
All true. I was thinking twice the speed of sound, but for some reason I doubled that. DOH! Plexiglass isn't that bad for a low speed windshield unlikely to have anything hit it anyway. But yeah, Lexan is more shatter resistant.
Plexiglass is plastic. It's also what they use for windshields on 300 mph funny cars.
Oh...forgot to mention, it's also the material used on 3,000 mph fighter jets.
I think you'll be ok.
Post some pics, but sounds like you had Harbor Freight wheels.
You need to measure, but most likely, you need 5/8" ID wheels. There are several places to get quality, safe gokart wheels. GoPowersports, BMI, and others.