[bigeasy1]

Both the glass and weatherstrip are easily available.

Any good glass shop can supply you with the glass that you need to replace your windows.
I replaced all the glass in my 1974 Tsunami with Tempered glass,and had a glass shop cut the new glass. He cut the glass from patterns from the old lexan that was in the long side windows,and from cardboard patterns that I gave him for the front window glass.
He then sent it all out to be tempered.

This was two years ago,and it cost me roughly $500.00 for all the glass in the boat.The only piece I didn't replace was the front port side as it was still good.

The glass in these boats (at least in mine)can't be any thicker than 3/16",or you won't be able to put the weatherstrip in.
The glass rests against a lip that is just about 3/16,and the weatherstrip has to be able to be pushed in and over this lip which locks it all into the frame.

The weatherstrip is easily available from American marine as mentioned by McGillicuddy.I got mine from them and it was pretty reasonable.They were the original builders of the windshields.If I remember right I think it cost me about $60.00 for a hundred feet.It's a piece of cake to install it.

Or you could buy the one that Entourage has and go that route.Maybe buy it all from him,pop in just the glass and sell the frame.It might save you a good bit of money.

Good luck with your project