Do you have the old windscreens? Duplicates can be made using the old one as a template. Contact local plastics manufacturer. I use 1/4" acrylic. It is available in different tints, and protective coatings depending on your requirements and pocket book.
Since iboats doesn't seem to carry that style, I'll recommend greatlakesskipper.com check their website, give them a call or, if you are in the Milwaukee area, stop by their store in Franklin, WI. It's called Kendor Marine. (kendormarine.com) It is a treasure trove for anyone needing parts or restoring a boat.
