1972 Canadian H-Code 340 Dart Swinger Special Resto - Finally started!

Great thanks. One more since I have your attention...
In the rear window channel corner, I placed my molding on to check fitment, and the new AMD quarter is coming up short. How would you close this gap? I was thinking about tacking a filler rod in there to close it up, like I saw someone do on their door edge. What's your opinion.

Thanks a bunch.