Bookmarked--
it would have been advantagous for the rest of us-but not you , if you had have broke off the front clips on the rear sail panel like most everyone does and had to do a fix -so the rest of us could have seen how you would deal with it.
About the only stuff I know might work is cutting a new piece out of spare mb interior parts and the try to glue it in with the special Flexable Parts Repair kit sold at parts stores for fixing urathane bumper covers. most other gues -like two part jb weld stuff probably wont work---But there are other epoxies that would--that sticks like crazy to any plastic.