Repairing the rubber membrane on top

[BristolApp]

While backing today I rubbed the top corner against a low hanging maple tree limb. It broke the corner plastic piece and rubbed a small hole in the rubber membrane. I've temporarily patched with caulk. Does anyone have any suggestions on reparing? I'm assuming I can purchase the plastic corner piece-?

[Bigredtruckmi]

The membrane is one piece front to rear. There are repair kits from camping world and local Rv dealer.