DuMont CRT Mounting rubber?

[Ralph S]

I've used the following from McMaster-Carr both in my Dumont and RCA sets:

1/4" X 2" X 36" 10A Neoprene rubber #3207K13 $15.22 each

1/8" X 2" X 36" 10A Neoprene rubber #3207K12 $10.16 each

The 10A is the measure of softness and it pretty much matches what you'd expect a manufacturer to use when mounting a CRT.

With the 36" length, you'll probably end up with enough for another set! Good luck.