Chances are your dealer has - or can order for you - the proper moulding. Couple of years ago I had moulding pull away from a window to the extent the window almost popped out driving down the road. Good ol' Duct tape to the rescue. I went to Campingworld Service Dept and lo and behold they had the moulding in stock. I took it to an automotive window repair shop who put it in for the astounding price of $25.00 (plus a tip to the installer). You may want to just cut a small piece off and take to dealer so he can match the profile. If not, there are online sources that sell this stuff and have pictures of the profiles so you can match up.
Ed (N4RWU) & Becky Taylor
Mistie (Walks 4-down)