Ian, the material in the channels are the same for the back and front, they are just different lenghts. When you look inside your door, you will see the metal channels that the cloth channel goes into. Usually you make one side the length of the metal channel and the front channel goes across the top and down one side. So, it will be an upsidedown L for the front channel and then a straight piece connects to this top L channel. Usually there are catches at the bottom of the metal channel that hold the cloth material in the channel but i find that if you use 3M super weather adhievsive it will hold the channel in quite nicely. The L channel will always go to the front of the car, even on the front and back doors. Usually a hack saw is the best tool for cutting the cloth material for the window channels. DRy fit the channels and tape them in position over night so that they will maintain their conformity. Place the channels in the bottom first and just work the channel up and around and then after you have put the 3M super weather adhesive on retape as before. Don't worry about the 3M adhesive because it will peel off anywhere you accidently get it on a surface. Hope this helps.