This past week I installed a rear window in a porsche boxter. I used a kit my client bought from www.emiata.com. I will say it is a decent kit if you don’t have the means to take the top off, sew in a new window, and put the top back on. They claim it will take you 2.5 hours with two people sewing(one inside, one outside.) If you want trim inside to cover the window edge and you care about how your stitches look on the outside it will take much more than 2.5 hours. I will never use this kit again. I will do the research and come prepared to take the top off so I can stitch the window in with my machine.  That said, it turned out nice and my legs are incredibly sore from getting in and out of the car twice for every hole.