After talking to Grady, they referred me to TaylorMade , who made the windows. Discontinued and no parts was the reason ly from TaylorMade. I don’t see a way to remove the seal without destroying it.
Different model boat but similar problem. Windows are discontinued. Best answer is acrylic (for clarity) or polycarbonate for a little longer life. Make them fixed (not openable). They are opened so infrequently. Need air: Open the hatch.