DuMont CRT Mounting rubber?

[Eric H]

I need to find a suitable substitute for the CRT mounting rubber on an Andrea that used a DuMont tube, I have a Crosley that needs some too.

DuMont, Crosley, Andrea and other clones all used this.

The condition usually varies from melted tar all over the face of the tube to rotted beyond use.

It's a medium stiffness rubber foam I think, maybe .25" thick X 2.5-3.0" wide, black to absorb light and it extends over the tube like a hood so the usual double sided tape wont be satisfactory.

Any ideas where to get something like this? (in small quantity)