How the flock do install this JCW stuff

[CHEVYJEFF]

Going to replace my drivers side window and track felt (flock). Thanks to the P.O.S.M.F. that broke into my truck 2 weeks ago. I got the flock from Jcw and noticed that its all one piece compared to the stock one which was a 2 piece setup. Since I have to replace the window which means the vent window assembly has to come out, how do you install the felt. I was thinking of cutting it into 2 pieces like the stock one and using weatherstrip adhesive to glue it in. The directons that came with it are not that great. Any help or hints would be greatly appreciated.