FASCO Cheater Heater Questions

[sc310c]

My 87 FC 35 has this type of heater under the sofa and I am having problems
finding anything on them. Does anyone know where to get replacement parts for
these heaters? The one that I have has the thermostat switch broken in it. I am
looking to get a new switch. If that is not possible, I would be interested in
replacing the complete unit with a compatible one. Any help with this would be
greatly appreciated.
Thank you in advance,
Bob Maloney