We replaced those plastic trim strips with aluminum carpet transition moldings that are sold in 8-foot lengths at the big box stores. As others mentioned, once you pull off those flimsy plastic parts, it reveals the sealing caulk that is actually holding the bubble skylights in place. Look carefully in the corners of the windows for stress cracks that are often the cause of leaks in these areas. The cracks form because the window parts were cooled too quickly when they were vacuum formed over a mold at the factory.
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The cracks can be fixed by drilling a small (1/16-inch) hole at the end of the crack to stop it from advancing further, and then filling the crack with solvent-weld glue that designed for acrylic plastics. This glue is super-thin and easily flows to fill the cracks.
