Anyone ever replace the rubber U channel (or edge trim) that goes around the tank edge between the motor mount? If you have, do you know the size and where you bought it from? I have several that needs replacing. And, it helps seal it close.
In the past, I've used thin self-adhesive gasket material (like the kind used on Kirby soleplates). You can place it around the opening and fold over the edges and it will form the same seal as the original did.