Having parted out a number of Cruisairs, and a few newer Bellancas, I have found fiberglass trim pieces that go over the fabric at the top of the windshield, and go a little way down into the windshield area. I always assumed it was to make sure the air didnt have a way to get under the front of the fabric at the top of the windshield. It also made the seam more water proof. ______Grant.