Did the 92 240 sport actually have a windshield or a windscreen from the factory? And is the hull the same on the 90 235 baja?

If you're referring to the 240's that were sit downs and had a built in fiberglass swim platform, they had a wrap around acrylic windscreen.

Yes..that's the one..Any idea where I can get a replacement?

Unless you find one that somebody is parting out, you'll have to get one custom made at a plastics fabricator.

A friend of mine has the same boat , he bought a used wind screen and it broke before he could get it home (25 year old plastic is very brittle ) he ended up having a race faring made out of aluminum .