Hi Chet,
Sorry to have misunderstood. As I have experienced a similar issue when fitting the new panels I created using tempered masonite for its backing. I gain some of the space needed to compensate for the added thickness by moving the weatherstripping flange further into the car. However, this move only helped but did not provide all of the needed space. I tried to find some additional space from the aluminum surround panels but to no avail. I finally, and I am sorry to say this, secured the small additional space needed from adjusting the door.
Although you have indicated not having sufficient space when eliminating the weather stripping, I would not have expect you took the drastic move of bending the weather strip flange or slightly deforming the upper portion of the sill under the aluminum facia. I also would not expect that the added space you need is anywhere near that which I needed.
Good luck Chet,
Ray(64BJ8P1)
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