I ran a line of electrical tape even with the aft edge of the front part of the rollbar, but, really, the window already lined up perfectly except for a small part at the base of the right side. Used the edge scraper from ATS (expense) to bevel top and bottom edges. I sanded it down with 225, then 400, then 600 sandpaper. Then I drilled out all holes to #27 and took a deburring tool to all holes. I used the scraper to bevel top and bottom edges and sanded those with 225/400/600. I sanded out the accommodation for the fuel filler neck and sanded that. Drilled out holes in the turtle deck to #27 using a reamer and deburred. Broke the edges inward for a better fit. Cleaned it all up with mineral spirits and decided to let it dry completely before reinstalling the window (tomorrow? maybe) at which time I'll run a bead of ProSeal to keep the water out.